Unauthorised debit orders

Hi. I took up Pricelock for R749 in December and on the 2nd January R899 was debited from my account of which it means my account was activated. On the 1st February R2223.86 was debited of which it did not go through because it was a very high amount for what it should have been. On the 1st March R2859.96 was debited and also did not go through. I have called multichoice more than 10 times between February and now to fix my account with no luck. I am very frustrated because my services have been suspended even after I paid R849 and after I called multichoice a d they said I must pay an extra R1200 of which they can't even say what is it for. The agents at multichoice are very *********** as they have dismally failed to fix my account and instead are trying to rip me off.