Received a call at 7:30 PM CST and they left no message. Called the number back and it says Bank of America.

They did it again today Oct 27, 4:50 PM. I answered and they hung up. Weird.

We got similar calls from this number.  No VMs left and even what seemed like a hang-up.  I called BoA's main number 1-800-432-1000 and a rep informed me that it's a marketing effort for loans.  The rep suggested they were using an auto-dialer that was looking for a live response which would explain no VM being left.  If it doesn't get the live response in a certain amount of time it probably just hangs up and moves on to the next number in their database.