RCS thinks I am Laundering money through them

RCS thinks I am laundering money through them ,I paid RCS by mistake thinking I was paying my home loan because payment for both was at the same bank . when I realized my mistake because the bank called to ask why I have not made a payment .I immediately called RCS to inform them when I realized I had been making payments to them and when I tried to get my money back I did everything they requested me to do in order to get my money back but they are refusing to give my hard earned cash back to me implying that I am busy laundering money through them