Stay away from Netstar!

I have been a Netstar client for many years now. I cancelled my membership telephonically about 4 or 5 months ago as I no longer own the two cars that were covered by Netstar. I cancelled my debit order with them on the FNB app, but they keep on reinstating the debit order, and every month that passes, the amount grows because, according to them, I am now in "arrears". They are threatening me with legal action and blacklisting. They must be so desperate. Why should I pay for a service I'm no longer getting? Why did they not cancel my subscription when I phoned in? I have sent many emails defending myself and explaining their incompetence, but the one hand doesn't know what the other is doing, resulting in me getting fresh calls and threats from different agents of theirs on a regular basis. I may also add that their response whenever my car batteries got disconnected for maintenance purposes was close to zero. Are they not supposed to phone and check if all is ok? I am very upset with their aggressive stance on a matter that has arisen due to pure incompetence on their side. I am now waiting for the action against me, according to the telephonic conversation I had with the person who called me this morning about my "arrears". I now have two other cars (different from the ones with Netstar) that are covered by CarTrack. What a difference.....they are cheaper and phone me or my wife instantly when I disconnect the batteries for maintenance purposes. Netstar could learn a thing or two from them.