Data bundles not loaded

This is to complain about MTN that is no longer laoding data bundles as the according to the contract. The initial contract was between myself and Nasua mobile but later on Nasua handled the contract over to MTN. Somewhere February 2015 MTN started to laod less bundles and deducted more mony than the one speciffied in the contract and sometimes deducting on the wrong date. I compliained during April or March 2015 about this and I was promised to get my staff according to the contract. Till today since I have been waiting but nothing is happening. Starting from June 2015 till now I do not get my data bundles at all but payments are always not missed, they always go thruogh. Now I am sick and tired of MTN, this is to advice MTN that as from monthend August 2015 I will block MTN from deducting its payment.