Have a look at what your by-laws say about noise and “the peaceful enjoyment” of your lot. If there is a by-law to that effect, then you want to warn your landlord that they need to pursue this as a matter of urgency. If your neighbours are in breach of the by-law, they are in breach of their lease and the landlord is responsible for the noise issue too.
But being realistic, I would be talking to the landlord about letting you out of your lease early in exchange for you not dragging them to Fair Trading and the CTTT to get a reduction in rent backdated to your first complaint PLUS early release from your lease.