My father pawned a piece of jewelry with a pawnbroker in return for a loan. Shortly before his death, my…

My father pawned a piece of jewelry with a pawnbroker in return for a loan. Shortly before his death, my father gave permission to the pawnbroker to sell the pawn in settlement of a debt. However, the pawnbroker was not aware of this permission. I offered to pay the money back in return for the pawn. My intention was not to repay the debt, rather to get the piece of jewelry back and pawn it with another person. The pawnbroker refused to accept my protestation unless all the heirs agree to the proposal. Some of the heirs did not consent to the proposed course of action. When I approached him again with the money, [he received it, yet] declined to hand me back the pawn, claiming that it is within his right to keep it in settlement of the debt. Is it permissible for the pawnbroker to refuse to return the pawn after he got his money back? Has he the right to refuse to return to me the money I gave him, under the pretext that it was in settlement of the debt? And is he justified in making the return of the pawn dependent on the agreement of all the heirs?