Appalling service

I cancelled my Telkom line on the 21st December 2018 through the on-line service. Telkom is still billing me for the internet portion since this date, even after querying this with the billing department on almost 7 occasions and receiving various case numbers and reference numbers, this issue is still unresolved. The last reference number which I have received was ********** on the 17th May where one of the managers endeavoured to call me within 48 hours. I did not receive any calls from Telkom since 17 May to assist in reversing these amounts, and I’m at my wits end trying to resolve this issue. This is appalling service to say the very least. I can be contacted on ********** .