how to stop them

left no message, just gutteral sounds.....obnoxious

Called on April 22, 2009 at about 7:15 pm.
Answered call.  No reply.
Have unlisted number, SO HOW DID THEY GET MINE?

This is not a legitimate phone number from or for Citizens Bank. This is a supposed survey that requires you to give up bank balances. Something that a bank would never require to do a survey. This is a "Phishing Scam", fishing for your personal information.