double debits and incorrect billing

Ever since October last year when I took the explore package I've head headaches in terms of account billings..I made a payment in January via my credit card of an amount of R361.66 as required.this month February when I seen my bank statement dstv took R2059.without notice.according to me and what I see on dstv self service option under my transection history double premiums were debited. I'm now ****ed off and very upset.every time I have to go through this **** service, and according to my understanding I'm in credit if +- 510.how on earth does dstv and what gives them the right to debit a substantial amount.I need the balance of the debit order amount to be reversed and paid back in my account as I have other debit orders that's depended on that unacceptable debit dstv took. I need this sorted asap or else I will take the matter further and cancel this **** package dstv.someone in ur admin or accounts department always every **** month messes up.