called cell phone. No message left

They called my cell today with no message

Just called my cell, something to about saving engry.
Have a gut feeling this is a scam.
Remember, what does free really cost me?????????

Got call also, they hang up when you ask for address or number to reach them at.
Other numbers used for same scam also. Many complaints online if you search for "Association for Saving Power".
One complaint is that they steal valuables from your house when doing the "survey".

They call my cell 1 sometimes twice a day for last week. No messages and I don't bother calling them back, but I would like to talk to them in person. Some people need to get a life!!