Customer service worst I have ever experienced, and it seems like the finance department is non-existent!

I am now resorting to desperate measures to try to get someone to respond to me. I have been desperately trying to resolve an accounting issue with RCS Group – a Builders Warehouse account, for 4, almost 5 months. I have sent almost a dozen emails, and there were several calls (where you are put on hold), and every consultant make empty promises, assuring me that they will look into the matter, but not one of them got back to me. I have now been advised (by sms) that my account will be handed over for collection. Background: I opened the account in June. I received a sms beginning August that payment was not received (I opted for Debit order payments?), and then made an OZOW payment via the sms link received on 7 August. This payment was only allocated in October! How is this possible? My second payment was made in store on 26 August. My third and fourth payment was done via eft on 5 October and 5 November as per banking details that a consultant provided. After emailing my proof of payments several times, and several consultants (some extremely rude!) triple checking that I have used my correct account number details, a consultant finally realized that the banking details I was given is for Game store payments, and not for Builders account payments, although the same RCS group, and asked me to send a WhatsApp to the RCS WhatsApp line with the proof of payments asking RCS’s finance department to correctly allocate my payments. I did so on 21 November. -----I followed up on 29 November “no turnaround time for update kindly continue and be patient with use” ----- I followed up 6 December “Unfortunately not yet still waiting on finance” RCS’s customer service is non-existent, and I am beginning to doubt that the “finance department” actually exist, and something needs to be done about it. I don't know the specifics of what is going on behind the scenes there, but something definitely needs to change internally within the customer service and finance department. I really do not want to be rude, but the quality of service is nowhere near what I would expect from a company like RCS and I believe that this should be dealt with as soon as possible. My perfect credit record for many years, is now scarred, incorrectly and wrongly, and RCS need to correct this ASAP. • I am charged collection fees and interest on an account where payments were indeed made, I need RCS to correct this. • I need statements to be mailed to me monthly – I have never received and statement via email, although the consultants confirmed that my email address is loaded on their system and that I ‘must get the statements via email”. • And I need feedback regarding this query – updated would be refreshing as well!