The Mortgage Loan Contract signed by the buyer and the bank when handling the mortgage loan has the following provisions:

During the mortgage period, due to the fault of Party B (the buyer) or other reasons, the value of the collateral (the mortgaged property) is reduced, and Party B shall provide Party A (the bank) with a guarantee equivalent to the reduced value within 3 days, otherwise, Party A has the right to require Party B to pay off the collateral in advance.

if party b fails to provide the guarantee with equivalent value and pay off the loan principal and interest in advance, party a has announced that the loan is due in advance and asked party b to pay off all the loan principal and interest in advance, in which paying off the principal and interest in advance generally means that the bank directly auctions the property mortgaged by the buyers to get back the money loaned to the buyers.