The worst customer service from mtn

I have a data contract with mtn which normally debits the first of each month. This particular month the did not debit and I went to the bank the next day to deposit the amount.. On the 8th my simcard was inactive. I went to an mtn store at twin city mall with proof of payment to which the consultant told me there was nothing she could do and I must call customer service. I've called customer service over 15 times being transferred to the contract department. Each consultant I spoke to requested proof of payment which I glady kept emailing. Its been a whole week, my quiry has not being resolved and I have no received any after sending proof that I paid the account. Iam extremely irritated with mtn and at this point I just want my refund and they can keep their data.