Service failure

Service failure I contacted the car track to get a clarity as to how should I go about transferring a device from one car to another. Their response was positive that it can happened and there is a connection fee. Which was explained to me . I agreed, it a sum of R870 then we had an agreement of running of R290 for 3 months . Where I was promised that once they received the first debit they will then remove the device and install it, into my new car .Debit took place and nothing happened till to date , I've been calling them, and they were promising that they will get back to me but that too it wasn't happening. It surprising coz they don't forget to debit my account every 15 of the month. I am paying something that I don't have . I found this as day *******, why should I pay for a device that car track failed to remove from the car that I traded in. This is a simple service I requested from this service provider but they failed me from my to date .