DSTV and the system

I have been a loyal customer to DSTV but I have had enough of paying such a of money for watching the same thing over and over again.. DSTV is automatically deducting the monthly subscription from my bank account. I phoned there call center five times to cancel my subscription and they still deducted the money from my account bank account. I went to the bank and had the money reversed and DSTV tried again to deduct the money putting bank costs onto me because I made sure there was no money in the account to deduct. I am now hoping that this does not become a monthly ritual with having to physically go to the bank to not allow DSTV to just withdraw money from my bank account. Even if DSTV says not to worry we will reverse the money a week later does not make it right when you have canceled your account. It also takes away one's trust in giving any company the power to do this and would prefer to pay subscription fees on a monthly basis by physically going in or internet banking. I can only imagine how many people in SA having the same problem and how many thousands or millions of rand DSTV is holding for a week or two collecting intrest. It really is pathetic customer service and modern day manipulation of the system.