Account not yet closed since 2018 August

In August 2018 I submitted my retrenchment documents at Edgar's store in springs mall. A month later I went back for feedback I was told my account is paid up in full. I requested them to close the account as I am not working I will not be able to pay the account anymore. In August this year 2020 I received a phone call and SMS stating that I have an outstanding balance of R325. I told the lady on the phone that I paid the account in full and requested the account to be closed. However the lady could not explain to me how come my Edgar's account just resurface after 2years. I went to springs I was that the insurance for the phone it's what I owe. I told her that I did not know that I still had monthly payments outstanding and why did it take Edgar's 2 years to tell me about this account. I am currently not working but I'm getting SMS that my account has been handed over for legal action. The phone calls are being charged. The sms are also charged. Edgars please close this account as I was told it's closed. Your assistance in this matter will be highly appreciated. My email address: *** the settlement letter that I requested in 2018 please send it to my email. Thank you