Nonsense service - very disappointing

Never been so disappointed

I figured the device was not working and reported it, even took effort, agreed to and drove all the way to menlyn service center but was turned away (no booked appointment, even though I was instructed by a cartrack representative to go to the center)

Over two months later, this is still not attended to yet I'm being called everyday (I stopped making payments), that my account is in arrears and in breach of the contract.

A bunch of unprofessional employees as well, rude and really doesn't even seem to understand what their jobs should be.

A contract that I have with them is two ways, they provide a service to me, I make payments. When they stopped providing this service, how is that not breach of the contract?