Poor contact centre service - Unable to allocate my payment

On 24 November 2017, I made my account payment at TFG store @HOME, received and sms from RCS stating that my account is in arrears on 13 December 2017. I immediately contacted their collections department to advise that I have made my payment and was advised by the consultant that I needed to forward my proof of payment to ********** which I did the the same day! Further to this I was advised by the same consultant to call back the following day in order for them to confirm receipt of my payment. Much to my dismay I was advised that it would take about 7 working days to get this matter resolved, I immediately asked to speak to a manager or team leader and was placed on hold by the consultant for over 20 minutes! I decided to drop the call and called back just to speak to another *********** consultant who finally got me a supervisor who was just as useless and could also could not help me. I made call upon call and spoke to many people who gave me different stories and never got back to me! Today I called in again and spoke to a Team Leader by the name of Abigail George who advised me that their merchant department are backlogged and could not provide me with an indication of when my payment will be allocated. I have now received the second sms from RCS today stating that I'm in arrears and need to make payment! Throughout this entire festive period my card was blocked and my credit rating affected negatively due to this which I feel is totally unfair towards a paying consumer who had never skipped a payment! Their contact centre staff are really *********** and unprofessional. Truly the worst service I have ever experienced! FYI, I also managed to get hold of RCS' CURRENT CEO. Guess what? No response, no nothing, we simply don't care!; just an indication of how much they care about good customer service from the top which is clearly shown adopted by their lower level staff and management!