WCA is a "soft" spam company - ostensibly compliant with FTC and state laws, but they buy lists from website that collect sign-ups and requests forms. Many of these sites don't make it clear what you're signing up before they sell your information to WCA. To opt out completely, you can go to: http://www.wcaconsent.com
A hang up call
They called me today at 4:09 pm EST. I didn't answer because I don't know the number or the area code. Actually they have called before but my rule is if you can't leave a voicemail you really don't want me. I hate it.