Deactivation

I am seriously frustrated with the bad service of cartrack, I've been in contact over a month now trying to get them to deactivate the tracking unit because I do not have the vehicle anymore and also the 3 year contract is long time over. The service is really pathetic. On the 1 May 2021 I received an email from Palesa Moabo stating that the request has been sent to the relevant department. But I still have not received response stating that it is deactivated, instead cartrack keeps on calling me for not paying for the month of May, I will not pay for something that is not in my possession. That unit needs to deactivated and the account canceled.