****** Bikes but Cartrack still Billing

Have been fighting Cartrack for more than 3 months now for a billing on motorbikes that were ****** and had the Cartrack device. Cartrack failed to track the bikes using their devices and I could not recover the bikes and in the process their devices as well. What boggles the mind is that Cartrack continues to bill me for those 2 bikes that were ******. One thinks they would have shame since they failed to recover the bikes but hell no they still want me to pay for them. They have billed me for 4 months for these bikes and I have spoken to almost everyone at their offices but no one can solve this.