Wrong billing and cancellation of services. Debt collection. Clearing my name

It has been over a year and few months since I have been having issues with Telkom internet services. The issue of connection started beginning of 2020 until I had to switch to fibre via Vumatel. I was double billed for the LTE and fibre which was only sorted out after 4/5 months. Mind you the reason for switching to fibre was the need of having uninterrupted internet, however that wasn't the case. When you log in a call for a technician no one comes to sort out the fibre connectivity from Vumatel. I had no choice but to cancel the line as it was costing me more money to keep because of additional cost of buying data. Funny enough once Vumatel could see that the line is not being used or being paid, they started messaging me wanting to find out what the issue is. Because no money is coming in for them, but they don't make efforts for after service of staying connected. Same thing with Telkom. I cancelled my line December and still got billing until June/July. I have disputed the bill many times, log call still being ignored. Emailed two of your staff members ( warren David and Indren Rajendren) since last years double billing and they still ignore my queries. I now get debt collection emails which i have been ignoring too. I went back to those two staff members to sort out the issue but no feedback four months down the road. I have explain this many time to the staff members that this is affecting my credit record and many career/ business opportunities because of lack of urgency and professionalism. How long should this be going on until someone get my name cleared?