I just received a call from this number. I did not call back. It seems that other people have been getting calls from these people. I'm glad I didn't pick up the phone.
I got a call from them today and they didn't leave a VM. I called them back on my work phone and got WCA Subscribers saying it's a line for premium subscribers and they didn't recognize the number. They give you an option to unsubscribe a number, but when I entered my cell number it just went to a dial tone, so I dont know if it worked or not.