Unprofessional and embarrasing

Besides all the other issues I had with Telkom they cancelled my contract and now want me to pay cancellation fees for that. MDB has been calling me, slamming the phone down in my ear because I keep telling them that I didn't request a contract cancellation, I was warned by MBD consultant that they will keep phoning me until I sign a cancellation document. Which I'm refusing to do. The last time I phoned Telkom they said they were going to talk to the various departments involved and then get back to me a year later and I'm still waiting. The interesting thing is that all this happened because I wanted to upgrade my contract. Bad service, departments that don't know how to handle customers and a legal department that uses harrassment to get what they want and this is how they expect to keep paying customers