Worst service ever!!!

Cartrack once again has gone out of its way to prove that they are ***********. I do not regret cancelling my membership with them. They keep sending me letters that they have handed me over for an overdue amount and have listed me on credit bureaus. I do not owe you guys!!!! Stop this nonsense i have been speaking to you guys for the longest of time where you keep dropping the ball i wonder what would happen if my car was to be ******. I even spoke to your CEO office with my last complaint, and they assured me that they will resolve this mess and clearly you didn't. I dare you to mess up my credit rating which i have worked hard to build and maintain positively. You are the worst and have hired *********** staff that don't know what world class service is. Fix this mess and stop sending me stupid communication that does not relate to me. I will take this up further with regards to TCF