Cancelled account but still being invoiced, and amount just grows.

Account no. ********** 41112. I have cancelled this account in April 2017. Reference no ********** 53, I have a sms with ref no. and that states may account has been back dated and cancelled. And I have another reference no. ********** 66 with a case no. ********** 4 to get this account stopped. Two credit companies have contacted me with my account that is on arears and as soon as i gave them my cancellation form and told them the story they disappear, I've send my cancellation to the the cancellation department as well, put i'll still being invoiced and held responsible for the account, I sitting on around R 4000 now. Can someone at Telkom please wake up and sort this out, and please feel free to contact me, this is very unprofessional. I'm tired of being send around from person to person phoning 10210, with pointless reference numbers.