RCS, please pay me my money!

In April I got loan consolidation loans. Unfortunately both of them settled the RCS account, as their choice way based on my information on credit bureau. This resulted in me having a credit on my RCS account. I have asked RCS over and over again to refund me the money on my account. Almost three months later, I am still waiting.

They said that in order for them to pay me back, they need a copy of my ID, my bank details (as if they don't know where they have been debiting my account from) and proof of payment (EFT). Since I did not receive any proof of payment from my creditors, I sent them my contracts stipulating the amount paid to the RCS account. Any normal human being would assume that that should suffice. Unfortunately that is not enough for RCS. I asked them if they provide their clients with EFT proof of payment after settling their accounts. They have not yet responded! If they do not provide such proof to their clients, why do they expect others to provide such????

Since the account was settled a day or two before the debit order date, they unfortunately debited my account. They have not returned that amount either. I suppose they are waiting for proof of payment from me to show that they debited my account, as clearly they don't have that information in their books! REALLY!!!!!

What is worse, after numerous calls that get dropped when I answer, one of their call centre agents eventually spoke, and offered me a loan. After this treatment from them, I will never ever do business with them!

Which entity can I contact to get RCS to pay me the money that I am sadly paying interest for, while they interest from it!!!