Unreliable After sales team (after paying for three years in advance)

I have been requesting Netstar to fix a non functional module on my car since i got the car. I drive a wildtrak and need to be aware my car is where i last left it at all time without the occasional walks to the car. everytime i call and ask for reference for the call, i am told to use the agents name or my account number. its been 6 months and nothing has been done. I have sent emails, reported this issue on hello peter and they called and still did nothing. My only regret is paying for this service in advance. I would like to try a new tracking agency. is there anyone that can assist me before the worst happens.