Company Mistakes, Lack of Accountability

I recently renewed my contract, and based on contract I am allowed to call any 8ta cell for free in first year of contract. On the 7th August while on a call, with an 8ta cell the call cuts and I get an sms to say that my minutes are finished. I had around 80 to 90 minutes which telkom mobile used on calls that were supposed to be free.I immediately called the call centre & lodged complaint. After no word from 8ta I began calling them the following week. All the operator could say is someone will attend to my complaint and call me. with no response after awhile I call to hear that someone is dealing with my case. I will receive a call from them. After no calls, I phone again to find out that the matter is resolved. I am allowed to call 8ta numbers. On querying what about my minutes that have to be refunded I am told that my bank account will be credited. I state that I want my minutes as a credit to the bank account does not help me. I ask to speak to a manager. twice operators have taken my number and have not received a call from anyone. Sick and tired of service. Telkom Mobile make a a mistake but I must constantly query and no apology or correction of their mistake