Bad bad bad service

A few years back I had a account with Telkom where I had a ADSL service. My copper line was cut and I was down for more than a week. After struggling to get a tech out the tech advised they cannot replace the copper cable and will have to put me on LTE. I was advised the LTE will not be a new contract but will roll on with my ADSL service. So bare in mind I was told I was not locked in a new contract and that it would just be month to month. I then cancelled my account with Telkom to move onto Fibre when it became available in my area. Telkom advised on the cancelation call that I would not be liable for all charges and that it would be removed. On my credit scores it shows I owe telkom them over R3000. Where did this charges come from? I called telkom today on the 19.11.21 and the CSA that spoke to me dropped the call after he could not advise me why I am still being charged. This appears on my credit record and after 2 years telkom could still not resolve my billing query. I'm honestly sick and tired of Telkom. When I had LTE the network was really bad however I've still paid my bills to them. I've been a paying customer with telkom until Fibre became available. Someone assist please.