The very same happened to me. Its in my contract that i received 24 hour response to Maintainance requests, included in my already extortinate monthly rent.
The new rent laws were introduced, and immediately I was asked for a monthly Maintainence fee. (cash). The maintainence was poor already, why would you pay more. The dishonesty was the clincher, so we moved. Greed makes people untrustworthy.
Your contract, no matter what certain people say, is not worth the paper it is written on and the system is still not yet fully supportive of tenants, despite a few recent victories.

You can laugh at me all you like because I have Alzheimers, .......but at least I dont have Alzheimers