Who called from 2815040039

I'm getting calls from 303 and 623 numbers on my cell and, a minute later, on my home line.  Now today it's a 281 number. They don't answer when I pick up and they don't leave a message when I don't. What's going on?!?!?

On my caller ID it said "Cameron Cooper" with the phone # of (281)504-0039

They called again. I'm really thinking about changing my number. So I called these people back at the number on the caller id and it's busy. I don't get it!

Thats probably wamu calling?

Caller id shows Sears, but when you call it answers Washington Mutual.
This is illegal per the FDCPA.