Dstv bad service ever,

I called DSTV to cancel in April, o spoke to the consultant that advised me that it will be done and the will not debit my account as I have canceled. Month end DStv debited my account when I called the consultant told me that they will refund in two days, came that two days mi was not refunded. I called them again the consultant advised me that I need to call my bank to do a reversal as DStv does not refund which I did. A month later a received a call that I owe them money how, I was told that the subscription was not canceled but how is that my problem cause I called to cancel, since then I have been calling requesting to speak to the supervisor or manager but no one want to assist me. Tried to use the Facebook channel is I’m not assisted.