Classic spam call. Add it to your block list. Here's the voice mail they left on my mobile, transcribed by Google Voice (great service!):
Informing you that you are now qualified under a recent bill passed in congress called the American recovery, and we investment act permanently reducing your electric bill up to 60% through the us renewable energy program the us renewable energy program will stop the 14% rate increase on your electricity bill coming soon press 1 now if you are a home owner, and are paying more than $150 per month for electricity press one now to stop the electricity bill increase coming soon again press 1 now if you are a home owner and pay more than $150 per month for electricity and would like to stop the rate increased, and if we have reached you in error and you want to be taken off the list press 3.
I got a call today at 10:29A. I thought it was someone calling back so I answered. There was silence and the a canned message telling me to press 9 to be put on a do not call list. I just hung up without pressing any numbers.