Multichoice procelock billing

I signed up for explora ultra price lock for R599.00 per month. in June and July the money was paid no problems, however in August when we paid the primiums we were told that the account is in arrears and they suspended the services, I called in to find out what is making the overdue amount they didn't explain it proper and unblocked the account. to my suprise the account is been suspended again and I don't get any help from the call centre agents. i've been calling and calling I don't get any help. can the price lock department get my billing correct or else they must just cancel the contract.