Cartrack poor and unreliable

Cartrack has the worst service to offer clients. I joined cartrack in October 2020 as my insurance company demanded I use Cartrack. From October 2020 up to April 2021 my unit had to be changed 3 times due to faulty units. In August 2021 my unit lost signal and they are unable to track my car. I paid them end of August and September as per contractual purposes when i was informed in October my unit is faulty. I decided to cancel with cartrack but was informed that i need to pay n penalty for not honouring a 3 year contract. I decided to give them a chance to fix their unreliable services and made an appointment. The technician never showed up for our appointment. (I am aware that this was not the technician's fault as he asked the call center to inform me to move our appointment) after the technician not showing up and the call center being closed on Sunday's I decided that I am fed up with Cartrack and will no longer make use of their services. After multiple conversations with Cartrack staff I made it very clear that I do not wish to continue my services and that they can close my account. Now I receive threating letters that they will hand me over to their attorneys, add me as a default payer and suspend my services ( even though I do not receive any sort of service from them). I am in shoch how Cartrack can be this arrogant if it is their units and service that is bad. In the threatening letters they also state that they are unable to make contact me even though I am talking to them once or twice a week telling them I am not interested in their services and that they need to close my account. Please think twice before contracting with them,, unless you are seeking a company with unreliable services, then Cartrack will suit you.