Okay, having read your latest post, I get it. Daddy feels he is protecting his daughter, and is an accusatory asswipe. If he's not the real landlord, then turning up the pressure may be a good strategy. He will hate you forever, but if she's the landlord and isn't totally-beholden to him, who cares?
Get out your lease and determine what self-help rights you have. Can you abate the problem and seek reimbursement? What does it say expressly about the procedure for system repairs, if anything? What does the "notice" section of the lease say? I don't know Canadian law, but here in the US, I would promptly comply with the Notice section of the lease and any requirements regarding steps you are supposed to take to obtain landlord-paid repairs. And focus on anything to do with uninhabitability.
So, if the notice section requires a certified letter to the landlord at a particular address, do that, and then email her a copy showing that it's been sent to her however it was supposed to be sent (since she's not home, and you know that).
The letter should say something like:
Dear Ms. Jones,
This letter refers to that certain lease (the "Lease") between Martha Amy Jones ("You") and Ziggy Thirteen ("Me", "I"), dated as of Whatever 5, 2017, regarding the premises at 15 Smelly Street, Somewhere, BC 123XZ5 (the "Apartment"). I am writing pursuant to Paragraphs X, Y and Z of the Lease to notify you that an (use the lease terms) Emergency Repair is necessary in the bathroom of the Apartment. Specifically, an extraordinarily-noxious odor, which I believe to be Sewer Gas, is present in that bathroom. I further believe that the wax ring in the toilet installation has degraded in the ordinary course such that it no longer sufficiently seals out Sewer Gas from the toilet installation, and such gas is now flowing into the bathroom. This situation began several days ago, and has become increasingly bad. Because Sewer Gas is normally a mixture of toxic and non-toxic gasses resulting from the decay of organic matter, and is known to include such gasses as hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides, I am concerned that the presence of such gas makes it dangerous for me to occupy the Apartment.
I have discussed the situation with Mr. Ass Wipe ("Mr. Wipe"), who I understand to be your father. He does dispute the presence of any smell whatsoever. However, I have had several people come to the apartment, and they concur that there is a strong gas odor in the bathroom.
In an effort to resolve the matter informally and with good will and in good faith, because I do otherwise enjoy the Apartment and had wanted to resolve things simply and amicably, I had proposed to work with Mr. Wipe to change the toilet wax ring ourselves as a Do It Yourself job, but he refused. I then proposed to hire a plumber to investigate the situation and replace the wax ring if he thought it necessary, and to pay the plumber's service charge myself if he determined that no repair was necessary. Again, Mr. Wipe rejected my proposal.
Given the potentially-toxic nature of Sewer Gas, I believe that its presence may pose a health threat and thereby render the Apartment uninhabitable pursuant to Paragraph ___ of the Lease. I understand that I have the right under that provision to [whatever it says, like temporarily vacate the apartment and withhold rent until the condition is repaired].
However, I do not wish to resort to such actions, nor do I wish to involve the local Building Department [or whatever it's called where you are], because it seems to me that we should be able to resolve the problem amicably and promptly. Accordingly, I hereby propose to you what I proposed to Mr. Wipe: that I call a licensed plumber to inspect and potentially repair the problem. If he finds nothing wrong, I will pay the service charge for his visit. If he proposes to replace the wax ring, and agrees to a charge of less than $250, I will have him complete the repair. If he proposes to charge more than that amount, I will contact you with his report and price and obtain your permission for him to proceed. I will pay the plumber, and I will then deduct the cost of the repair from my next rent check, providing you with his invoice and receipt for my payment.
I hope that this proposal is acceptable to you. If not, kindly consider this letter a Demand for Emergency Repair (or whatever it's called in your lease) and notice of uninhabitability pursuant to Paragraphs ___ and ___ of the Lease and the Residential Tenancy Act.
You may call me at ______, my mobile number, or email me at __________, to speed things up.
I look forward to your response. Thank you for your attention to this.
Sincerely,
Ziggy Thirteen
That's what I would do. My goal wouldn't be to have to take any legal action, but just to convey that she has certain responsibilities and she's not meeting them, and it isn't up to her Dad just to be a jerk and say, "No," and have that be final. And that you have leverage. But you're a good guy and you just want to work this out.
Something like that will get her attention, and hopefully she will just pony up and let you get it fixed professionally. YOU need to take the high road and address her respectfully but firmly like this and not be a jerk back, because that will get you nowhere.
Good luck. Let us know how it goes.