Worst service ever!

My husband has been trying to get MTN to resolve an issue. They are saying his account is in arrears, yet we have been paying every month to an account they provided. I gathered the POPs and he has sent it to them as per request. He has been calling none stop for more than a week, has been going into store as well,the store in Century City. Everytime they tell him system is offline or that they can not locate the payments. Yet the reference number is on the papers. When he told them to cancel the contract they told him they can not, that he has to do month to month now. This is very frustrating because he just wants his update or to cancel the contract. This is the worst service we have ever gotten from anyone. I would not recommend anyone to go to MTN to get a contract.