RCS STOLE MY MONTHLY INSTALLMENT

RCS has really no clue of what they doing and the achaic system they use to balance accounts needs to upgraded, I have made payment the same I do every month via the app which has always worked but not this month. I made payment which took a day to reflect and then RCS reversed money out of the account which now shows that I never made payment but I have to prove to them that payment was made even though they reversed the amount? RCS needs to investigate where they reversed the money too? RCS has ****** my payment that I made and now harrass me with phone calls to ask for payment? Sort out your internal failures, find where you reversed payment to and get back to me? Absolutely disgusted!!!!!!!!!!! Would put in a ref number but they rattle it off so quickly was unable to take it down and then could repeat it for me!!!!!