I have this number since 1999

I have this number since 1999. Always debit order. Last year financially we had to change over to cash, paying instore. I did every month. I was supposed to finish in October to pay for my phone. Hahah what a joke two months later it seemed sorted. Then there was a debit order on my capitec account from Mtn R635, never authorised any debit order from that account and I had to pay in store as my services was suspended. I phoned call centre gave the reference nr from my bank statement. It was Mtn reference but they cant pick up the payment. So I tripled pay and still my account was suspended again in February. In march I paid R931 for service to be reconnecting. The store agent stated that I'm up to date. Going to pay my account in May I had to pay R700 where I had to pay R350. The store don't know what's going on and your call centre either. This needs to be sorted and I am not paying for something thats up to date and was up to date?!!!