What would you do if you have taken a loan from someone and returned?
Well, lets work backwards through this question. Nobody but a government official can legally take your passport. Nobody can force you to sign a legal document if you dont want to Asking for more money if you have already paid is breach of contract Refusing to accept payment may have completely voided the contract If you have already paid back the loan, you have satisfied your contract. Contact the police and/or a lawyer to resolve this situation.