I've had calls like that. Pisses me off somethign terrible. I pressed 1 to talk with someone, then tried to get as much information about who they were as I could. She didn't want to give the phone to a manager, or give me any information about the company. Plus, it sounded like she was calling from another country!
I've even had some that Caller ID says were "Cellular Call".
Anyone can get caller ID hacking software and put anything they want on the screen. It's really sad. Oh, and it's illegal, but how are you going to get the FCC to look into this?