If you are unable to reach a resolution with the vendor which in this case seems probable then yes an admin will determine the resolution. Like SelfSovereignty said please ensure your most recent proposal reflects the resolution you are seeking, you must also be sure to respond to any counter proposals that the vendor may make so keep an eye on the resolution clock. More information on how escrow and resolution matters are decided can be found in the SR wiki, the link is in the sticky at the top of this board.