I have to agree with the response stating that there really isn’t much you can do because all the terms and regulations have been stated clearly and what the landlord did is not wrong. The landlord followed the current lease conditions and you, as a tenant, can only abide by his offer or simply leave. I remember visiting a friend of mine while I was at a self-storage in Sydney, he told me that he did sit down with the landlord and have a good chat about the excessive raise of rent. At the end of the day, the landlord lowered it down out of goodwill as my friend was still studying and could not afford that much. So I think you can try your luck.