RCS. The struggle is Real

I am still struggling to get RCS to refund me money I have paid them by mistake. I contacted them informing them that I have made payments to them by mistake . they said that I should send them proof of payments I did that,they asked for a copy of my Identity document I gave it to them,they asked for my account number so that they could refund me the money, I gave it to them . I didn't hear from them for a few months so I called them to find out what is the hold up. they said I should get an affidavit stating why I have paid them the money and this was after they told me I am busy laundering money through Rcs. now they want a three months bank statement because they want to know where I got money to pay them even though I have informed them that the money I paid them was my home loan money. I would not have known that I have been paying RCS had it not have been for the bank that called me asking why have I not been paying my home loan