Can anyone provide a phone number for B of A Assumption department that someone will answer?

my fiance purchased a house a few years back, but was required by the bank to have a cosignor, as she was fresh out of college and in a new job. now that her job is secure, her cosignor would like off of the loan. the house is currently valued at about 55% of the total loan value, making it virtually impossible for her to refinance. she realizes that even if the cosignor signs a quite claim (which is not an issue to have done) the bank still won't review the refinance request. that means that her assuming the loan or using novation (which we don't understand quite yet) are the only plausible options. however, whenever we call bofa, there is no way to get ahold of anyone who knows anything about the assumption process. i had no problem with us bank in getting an assumption package sent to me, but we can't even get a person from bofa on the line that can advise on this. please help!