Messed around by Telkom

i moved over from adsl to fibre in june. i cancelled my adsl line in Feb/March 2020. you still continue to bill me for a service i cancelled months ago. i have visited the telkom branch 3 times, sent and made calls to telkom about 100 times I'm yet to get a correct bill. the consultants are very cagey always claiming to send the information to the refund's department and refuse to include you on the email they have sent out. I have continued to pay for a service i cancelled months ago in fear of being disconnected.