Netstar's refusal to allow account to be closed/Cancelled

I am currently having the most inconveniencing experience with Netstar where they are basically refusing to allow me to cancel my 2 vehicle accounts.

I had 2 additional Nestar trackers installed on 2 of my e vehicles with them. on 21 June I sold the 2 vehicles and on 24 June 2022 I called them and emailed the Cancellation. Weeks later I called them and requested an updated statement and found the cancellation had not been processed. To date I have been on the phone and email with them to have the cancellation processed as I no longer own the vehicles, Iive sent letters of complaint but unfortunately my account has been assigned to one person who is also the person I submitted the cancellation with. So it seems to me that she is blocking my cancellation and there's basically nothing I can do about it. In August 2022, they debitted R1521,11 which I reversed coz these amounts were accumulated on 31 July 2022 (R755,68) and 01 August 2022 (R700,43) , today being 29 September 2022 I reversed their debit now being R2286,54.

This happens to be deliberate and forcefull because I had reversed and blocked them with my FNB account. Netstar seems to have picked up that it's blocked and changed their code and made the debit go through. I'm left with email records of my cancellation while they maneuver and find ways to have debt increase in my name to eventually have me blacklisted. This currently compromises my one active vehicle tracking unit.

They want me to keep paying for vehicles I no longer own.

I'm highly regretting using NETSTAR.

I have also submitted a Complaint with my Bank about any ********** activity being allowed to take money anyhow from my account.