DSTV cancellation debacle

I have now tried for two months to get my subscription for DSTV cancelled. numerous phone calls and emails have been sent. I only received one reference number INC***. Today I noticed that the debit order has gone off again. even though I was given assurances by another call centre agent on the 28th of November at 18h54(***) that subscription has been cancelled. I am currently on hold once again with DSTV call centre for 24 minutes.