Bad service and no feedback

I made a change of ownership from my name to my brother's name. After it was changed I was still debited and I made a reversal. On the 2nd of April 2023 I then called to find out and the lady told me that I'm clear I don't owe them anything. During the month of June I started getting calls from their lawyers that I owe Dstv. I then sent them an email to complain about this. They told me that I activated Dstv via selfservice and I still disputed that because I never did that hence I asked for proof to find out which platform was used and I also requested for the recording of the call that I made on 02-04-2023 and until today I never received that feedback. I'm still getting calls from the lawyers but they cannot give me a proper feedback.