Failure to reinstall tracking unit

I had purchased a new vehicle in June 2017. I had notified Cartrack of the sale of the old vehicle and the purchase od the new vehicle in June and arrangements where then made for removal and reinstallation of the tracking unit. The fee was agreed to be paid over 2 installments. The old unit was only removed after my persistent following up in September and the unit has still not been reinstalled into the new vehicle even after agreed upon fitment dates were scheduled. I keep getting harrassed for the balance of the fee yet there is no unit in ny car and i have been paying the fees since May with no unit in use. This is unacceptable service. I have continously been calling and spoken to many consultants to no avail. Even spoken to personal accounts Tsutsi and even has not adequately been of any assistantance. The concern for cartrack is the outstanding fitment fee irrespective of the 6 month service fee that i have been paying for no unit. I am really dissapointed at the service i have received. Utterly disgusting!!!!