RCS - Jet Card, terrible service

I had a Jet account and settled this account in August 2020. I sent an instruction via email to the RCS group to confirm that they must close my account. I was told that it will take 36 working days to close. The 36 days are now up! In the week i received an SMS stating that i still owe R65. How can i still owe R65 if i settled the account in full in August 2020 and have not used my account since then. I have tried on numerous occassions to contact the call centre without any success. You get sent from pillar to post and nobody is able to help you. Some of the call centre staff are actually quite rude, after holding on for quite some time, the call just gets dropped and you are back to square one. I want my account closed! It is nearly three months now. Please can you have someone sort out the Jet account queries. This is utterly ridiculous. Your customer service is awful!