Settle the account!

My mother settled her account last year 2021 and close her Jet account. 2 weeks ago she received an sms saying she is in arears. She went to Jet stores in Greenacres mall, where she spoke to a lady named Pinkie on the phone. She was told to wait up to 72 hours for feedback but no one has gotten back to her. My mom is ill and this is ********** because she has since closed this account. I have called on numerous occasions throughout this week and we have not been assisted. We don't want to deal with Jet Stores anymore.