Is Mortgage Company bound by signatures?

a mortage company recently completed and signed all the paperwork agreeing to refinance my daughter's home. They also agreed to payoff the tax lein that was against her home. The IRS is giving a higher payoff amount than was originally quoted. Can the mortgage company back out or are they bound to pay the lein amount? The refinanced amount was lower than appraised amount.

[HomeGuru]

You have not stated what the papers were, so no one here can help you.

She has already completed the closing.

[HomeGuru]

Then next time state that.
The mortgage company is only obligated to pay the original tax lien amount at the time of loan lock.