*********** service yet again multichoice

It was about three days ago multichoice had called me and advised that they are running a competition if I agree to set up a debit order in which I have agreed which later I have realized that it was yet another gimmic from them. The lady did advise that should I want to make changes to this I could go onto what seems like an absolute useless self service site of theirs and make my changes. Last night when I went online to go and cancel the debit order as I have a new bank account and that I have no funds in that account, it allowed me to make the changes so I decided to call the call center ********** just to confirm, I spoke to a guy named Prince and he said that its too late to make changes when my debit order is set for the 2nd which is today, I did advise him that the lady said that I can make changes at any time I want.He then advised that I can change the date and that it will cost me R6. After he changed the date he then said I will be charged R26. Today the debit order still goes off yet I have phoned and requested for the date to be changed. Now I am sitting with the costs of the return debits when I had advised multichoice. This is the second incident with multichoice as in many months. They are quick to take your money but provide an absolute poor service. Their self service what ever you call it aswell is absolutely *******. I request multichoice to credit my banking account again as my account with them would suggest that I have made payment via cash. I am not willing to pay them a cent extra. I want my money back and they will have to compensate me for my bank charges.