RCS and Queenspark nightmare

We have a major problem with the company RCS and QUEENSPAR My wife is using QUEENSPARK credit facility to buy clothing She bought an ITEM in November 2024 for which she paid Queenspark via Eft R600 (60% of totalprice) before end November. My wife then asked two weeks ( in December 2024) later for the outstanding balance to pay the rest, RCS responded and indicated they did not receive payment (we forwarded PDF's from the bank) and started to charge her penalty fees. After numerus phone Calls to the call centre , nothing was resolved and just frustration started to creep into our conversations. Interest is charged on the full amount plus a "handeling " fee for the outstanding period. We eventually received a letter telling us we are late in payment, but the amount listed show a penalty which is not correct. The call centre is limited in responding to our request to send us a full statement to have a proper review and to settle this account. I personally think it is VERY POOR service from this group.