It's called 'caller id spoofing'. The people calling you can make any phone number show up on your caller id. They're making a number show up that charges you money if you call it and press a certain key.
At the same time they've disguised the messages on their pay by phone system as surveys. Those messages normally tell you what you're buying and how much it costs.
Check your bill for unwanted charges if you called this number back.
Called on my cell today at 1:30 pm eastern. I ignore calls I don't recognize. It is not BofA - they are not that stupid. Companies like this ignore the DNC since they are either out of the U.S. or just don't care if the government goes after them - they simply declare bankruptcy and go out of business and start over with a new name. If they call again I'll add it to the do-not-answer list by having my cell phone do silent ring if they call.