Terrible Customer Service

Last year, I called and e-mailed Tracker to advise them that my vehicle had been sold and that the new owner would be taking over the account. He already had an account with them and they could simply move the vehicle onto his account. I requested that they contact me, should there be any issues in this regard. Since then, I never received a statement from them, nor any notification that they had not been able to transfer the account to the new owner's name. Only when I received an SMS from Tracker, advising me that they were testing the vehicle, did I realise that they had never moved the account. When calling customer service to enquire, they advised me that it was my responsibility to continuously call them to determine whether they had done the necessary. Really? No e-mail or call from them to advise that they had not done what was requested? Their answer: they had called the new owner, but he didn't return their call. End of story. And since they had my debit order details - no reason to stop the debit order. Shocking, and bordering on ***** (since they knew the vehicle was not in my possession). I am switching to a new service provider for my other vehicles.