Makro RCS Card refuse to refund credits

I have received a response from the RCS refunds department, they expect me now to send proof of payments of the settlement eft I have done (no problem) but also they want proof of payment for previous months debit orders... I am not quite sure why they ask me this as my RCS statement is up to date and correct, the EFT and debit orders reflect on my account. So why ask me to prove if their debit orders went through? Or don't they trust their own billing system? It is a joke, yet I read of people who has been handed over for smaller amounts that they owe to RCS, now that they owe me they want me to write it off. That will not happen! It is pathetic, hopefully someone competent contacts me from RCS before I report them the the national credit regulator.