Debiting money for no reason

I have been struggeling with DSTV since May 2017, Every month a debit order has been set up for price lock and every month there is a problem so much to the point that my dstv account went into arrears. I eventually had to go pay cash the full amount and when i did i was told i was in credit for december and January 2018 this morning when i woke up another large amount was taken off my account. I dont know where the amount even came from because its not even the standard price lock amount. Since may they hadnt debited me for box ffice either and charged me an amount for not paying it but i was told it would be debited with my price lock. I have called many times even spoken to so called supervisers and gotten refrence numbers and each time its a different story but that the account was ok now. But its clearly not because a lage amount was now again debited off my account. I just cant seem to resolve this issue and no one can begin to sort the problem out. i am on the verge of cancelling the entire thing. Regardless of the staff memebers who dont have a clue about what they are doing but just the bad service and constant repeat of shows catch up not having "100s of series and movies to chose from" and the actual hard drive is smaller than the previous dstv decoders.