Irritating Cartrack

I am so fed-up with cartrack, They phone me three to four times a week and every time I tell them I have a tracker fitted in my vehicle and to please remove my phone number from their data base, but do they listen NO the freeking calls keep coming. CARTRACK GET YOUR ACT TOGETHER!!! PLEASE STOP PHONING ME!!! I'm sure this is contravening the poppy act or something.