Double payment deductions

DSTV took the monthly premium for my streaming service twice from my debit card account on the 1st December. I called them to ask them to refund one of the payments and they denied that they had taken two payments as only one payment reflected on their side. Eventually after numerous similar phone calls I visited their office on the 18th December and showed them the two payments deducted from my account. Sent them copies of both payments with the reference numbers. Having proven that I had made two payments I asked for a refund, seven to ten days they advise. Next day I get a call asking me to prove that the account they took the funds from is my account and a certified copy of my ID. I refused both as they had not required either of these when they took the money out of the account, just put it back in the account you took it from was all I asked. To date, no refund and no contact from their finance department, seems like a very easy way to skim money off customers accounts. Don’t sign a debit order and don’t give them a debit card number or they will keep on taking money, reason given for the double deduction? Load shedding…