WCA is apparently owned by The Firebrand Group (www.firebrandgroup.biz) 800-992-6299

Their registered agent in Arizona is "The Corporate Place" (corporateplace.com) 877-786-8500

I was referred to their attorney:

SD Heyman
761 Garden View Court Suite 202
Encinitas, California 92024
760-931-4722

A call to SD Heyman got me transferred to a voicemail and never received a returned call.

A google search reveals no SD Heyman in Encinitas, CA.

I suggest that anyone receiving calls from WCA subscriber services calls these places for every call they receive.  If they won't provide or honor an opt-out, I suggest we flood their phones with as many calls as they give to us.