DSTV messes up my account for the 5th time!!

I am fed up with the billing and poor service from DSTV! Since I got the premium pricelock package, DSTV has been billing me incorrectly and more often than not debit three times what they should. I have called so many times have written on Hello Peter so many times. Now that i want to cancel my account AGAIN I am being given the run around. I WANT NOTHING TO DO WITH DSTV ANYMORE! If you do not respond to this message and perhaps make me more empty promises from your consults about how sorry you are but insist i still have to pay... Well you have another thing coming!