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If the police will not help you retain a lawyer and have the lawyer send a letter to the owner threatening to sue the owner. The owner can put down carpets or evict the tenants or face a lawsuit.
This is nuisance and you can sue for an order requiring the landlord rectify the situation and pay you damages.
It is not about a by-law. If it was you would not sue but you would call by-law enforcement. This is about a civil issue and a tort which is a civil wrongdoing and that is why you can sue.
You need a civil litigation lawyer. If you end up suing it is your burden of proof so you will have to prove that this noise is going on. I suggest that you have witnesses either inside or your, or over the phone, or over facetime/skype, and that you also make recordings of what you hear.