ben
I called them back. An automated service answers the phone says:
"Once in a while, Bank of America calls with offers for services we feel you may be interested in. If you would like more information, press "1"."
So I pressed "1". It then asked me:
"If you would like for us to call you back, press "1". If you would like to be placed on Bank of America's Do Not Call list, press "2".
So I pressed "2". It then informed me that this request will take effect within 30 days, and will be honored by all Bank of America companies.
Hope this works, and I hope this helps someone else get rid of these annoying hangup calls.