Double Debiting of account

My DSTV account has been paid since 2012 via EFT. In September 2015 my business account was debited with the amount of R779. I called Multichoice to query this as I have no debit order with them. I was told that the EFT payment that I made since 2012 is going off against a deactivated smartcard. The reference I used was issued by them in 2012 and in use since 2012. She said that she can see that there is no authorization for a debit order and will come back to me the same day by 18h00. A month went by with no one getting back to me. Yesterday another debit order went off the account and my normally EFT payment. I phoned again today to query this and now my account before 2012 is supposedly in arrears and my payment has gone off to settle the arears. Not only was the previous account paid via debit order and due to them double debiting the account cancelled. It was only reactivated again in 2012. I am at wits end with the situation and no solution is being offered.