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Well at this point unless you have some proof of this there isnt going to be too much that can be done since you have already gone the BBB route. You only other options are to file a complaint with the CFPB or file an outright lawsuit against BOA for breech of oral contract and then it would come down to a judge deciding the matter.
Adding: At this late date the SOL for legal actions may have passed in your state you need to find out if it has or hasnt as far as filing a suit against them.