Dstv no authority to debit my account

I canceled my dstv subscription 3 months ago due to my decoder and TV being damaged by lightning. Dstv debited my account after strict instructions not to. I called in and got a refund for one subscription 7 days later. Out of nowhere in June my account got double debited for an amount over R1000. This is unbelievable! I called in to query this. The call centre committed to have my refund escalated and here I am still waiting. Why is dstv still debiting my account??? I've been inconvenienced and there is no sense of urgency just the mundane response of " it is our process to refund within 7 to 14 days" this is the worst experience.