Mess out of my bill

I have 2 explora decoders, the premium one on the 24months payment plan and the explora 2 on Compact. I pay by debit order on the last day of the month.

Last week i received an sms saying my services will be suspended if i do not pay R50 which I did pay and today i receive another sms saying my services will be suspended if i do not pay R35. Am i supposed to pay these amounts on a weekly basis even though the debit order was successful on the 31st?

When i call, I get a complicated story about funds being moved from one account to another and having a credit which i don't understand. Is someone from Multichoice running a **** or what? If there was a short payment, which cannot be my fault since i pay by debit order, how come that money is not debited on my next debit order? Who in their right minds pays for an account monthly and weekly?