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People can best help you if you describe exactly how this change in mortgage servicer has reflected itself on your report. So we need a "before" and "after" description.
BEFORE:
Date opened for the account
Balance
Original Amount of the loan
AFTER (for all accounts related to the mortgage)
Date opened
Date Closed
Balance
Original Amount of the loan
Also very helpful would be your AAoA (Average Age of Accounts) before and after.