As Dolly notes, there are ways to verify the name/TIN match that rely on source documents rather than commercial data bases. Here's a
link to a prior discussion.
I'm reluctant to file SARs in connection with TIN problems. First, because some problems are clerical. Second, because it's difficult to make some problems cross the SAR filing thresholds set out in the regulations. If a customer has a TIN problem, but also has a loan that is "paid as agreed" I would find it hard to conclude that he was attempting to defraud the bank. Repayment goes a long way toward logical verification of identity.