Edgars - billing on closed account

My edgars account was paid up last year may 2017 I paid it at the chatsworth branch and asked them to close the account. We never received a bill since then as I used to get e-statements when the account was active. few weeks ago we have been getting collection calls from an attorneys call centre advising urgent payment of R199 is required. When I emailed accounts@edcon they sent statements dated 2017 may and its R77 for mobile content and insurance I rep**** on that same email telling them the account was closed and I have never received any emails/calls till few weeks ago. Further to this they haven’t even sent a 2018 bill. Last email I got it says my matter has been escalated to that was on the 11th august, but the agents keep calling my landline at home, my ederly mum has to keep answering their call every hour advising payment is required urgently. Its different agents calling all the time. On Friday 17th August I had spoken to an agent from the collections dept advising of this issue and I did email edgars directly, she advised will make a note on the sytem and yet I get another collections call now. please assist as this is unacceptable service.