Complaint Review: Warranty Service Center

Warranty Service Center will not stop calling. When I ask to be taken off their call list they just hang up. Very rude. I imagine they hire any wanker willing to harass people.
They call both my home number and cell number. The last one was on my cell and when I tried to call that number back a couple days later it was disconnected. Anyone know how to contact this company?

Steve
Encinitas, California
U.S.A.