Remove my number from your caller list

I have a tracking system with Ctrack installed. After a request was sent via Google for Ctrack from my mobile app, the request was allocated to Cartrack. I have explained and asked several times not to call me anymore. However the telemarketing team phone me at least 10 times a day, any time of the day. I need my number removed from their caller list as they are spamming me with calls.