Edgars refuse to close account despite settling 2 months ago

On 23rd September 2020, I went to the Red Square store at Musgrave centre and requested to close my Edgar's account. They put me through to a call centre and the agent sent me a settlement figure of R170. 88 which I paid immediately. I have the SMS, the invoice and the bank statement to prove this. A month after settling the account, I received an SMS from Edgar's stating that I owe them more money. I called the number on the SMS and spoke to a lady named Bukiwe who told me that they had made an admin error and that it would be resolved in 48 hours. This was after being sent from pillar to post by the call center. I then received an email which made no sense whatsoever. I responded to the email requesting feedback and received none. Today a call center agent calls to say that I now owe them more than the settlement figure and will be handed over if I don't pay. I explained this was unacceptable because I paid the settlement and was told that the error was on their end, but still no joy.