Frustrated and stressed out due to the incompetence of the staff and managers at Edgars /RCS

I have an account with Edgars for over 20 years and have been on a six months purchase plan. In 2021 I purchased items on a twelve month plan as my six months plan was up to date. I paid the installment and around Nov 2022 my balance was down to R400. 00I and I then bought a bottle of perfume and requested them to put this purchase on a 6 months plan and my last purchase with Edgars was 2023 August. This year February I called customer service requesting a settlement letter and my current balance was R4000. 00 over my purchases. I've spoken to 8 customer service agents and they all couldn't answer my questions and the best they could do was to put the phone down on my ears. Have been communicating with their complaints department via email and waiting for their reply since last month. Visited Westgate mall to discuss my problem with the manager (Shereen) and she told me she will contact the person who will be able to assist me this issue a update me via whatsup, Nothing happened. I want to settle and close this account as I'm no longer working but Edgars is making things difficult and stressful for me.