Service disconnected and Double Billed

My Multichoice account for the past 18 months has been settled monthly via debit order. In the month of August my debit order went off my bank account and according to my Bank was successfully paid. My service was however disconnected and I was told my account was in arrears. I contacted the call centre and was told to send proof of payment to their finance department. I sent the proof and did not receive a reply for three days. I then contacted the call centre again and was told to send the proof of payment to the agent. The agent assured me the proof will be sent to the finance department but assisted in reconnecting my service. In the month of September my debit order went off but I have been doubled charged for the month of August which I had sent proof of payment for. I was also charged re connection fees. I have contacted the call centre again and was asked to provide the proof of payment for the third time! I am still waiting for a response on my complaint on their website which was raised over a week ago.