If you permit landlords to get away with increasing your rent more than permitted, then it is going to happen!
They can't kick you out of your home unless you are in default of payment or other provisions within the lease. If at renewal, they ask for a rent higher than what is permitted by law, you can refuse and take the matter to the relevant department. A couple of them do speak English and will assist if you give them the back up data.

Don't just give in....this gives a landlord carte blanche to disrepect the tenancy law which has been re-written for the benefit of tenants.