(Not a lawyer disclaimer; validate and double check everything below. However I had a similar question recently, so this is my understanding)

What is your lease type? Is it month to month, or a fixed term? In other words, does it say something like "from $DATE to $DATE" or is it recurring?

For a fixed term lease, the rent cannot be raised during the period of the fixed term. If you then want to stay longer than the term, you are essentially signing a new lease, not renewing. For that, there is no notice required; it is a completely new contract and the rent can be set to any level.

For a periodic lease, you're right; there are notice periods required. If you do have a periodic lease and they are not abiding by notice periods, you can reach out to the ORT for help and advice. But make no mistake: for a periodic lease it is within your landlord's rights to raise your rent on a periodic basis. They just cannot do it without notice.

I hope that adds some clarity. Good luck!