System errors charged double against customer accounts

W few months ago RCSoffered a Builders Store card which I accepted as I was startgin a new building project. In early October, due to RCS systems error, an invoice of over R9000 was double charged on my card. AFter weeks of being send from RCS to Builders and back again, the double charge was reversed. YEsterday, RCS deducted over R11 000 via a debit order from my bank account for the double charged invoice AND the minimum payment of R1972. Upon calling RCS, they indicated they cannot assist and that I can either wait and use the R11000 on the card next month or I had to reverse the debit order directly from my bank. RCS is useless and have absolutely no customer service. DO NOT USE RCS.