I got that same call this afternoon while working out in my basement.  They actually left me the computerized message saying 'my card had been frozen' press 1 to talk to the security department.

got a call at 10:30 p.m. Sunday night saying our account had been put a hold on.  said to press 1 for billing info.  we didnt' answer

I called the company to tell them about the use of their number.  They said they were aware of it and "the authorities are looking into it".  I'm sure they'd like to get to the bottom of it.

Call came in at 8:38pm 2/24/2009. Poor quality recorded message "(unintelligible)... Credit Union. Your credit card has been suspended due to suspicious activity on your account. Press 1 to re-activate your credit card."

It replayed then hung up. I called back to number which rang forever. Called police. They suggested Google.  Voila!

just recv'd the call this morning... exact same thing.... guess the fraud controls aren't working very well.