I'm sure you have done this already, but start by citing the regulatory requirement. For the loan estimate, it's found in comment 37(f)(2)-4. For the closing disclosure, it's in 38(g)(4)-2.
One tactic I have seen suggested in these forums is enlisting the clout of the state insurance commission.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8