Bad service

Went to the branch in polokwane to cancel my tracker. They can't find me on the system. Then tell me that it must be canceled. So this after 6 years that the same device was in my car. No new contract of 2years as in the beginning when I installed the device. So after a year after I sold the car reverse the debit order. Now they hand the account over??? When I phone to find out why. They try and sell me a new tracker. ***.