The right advice was just given to you go see your agent they can sometimes get things done and paid for and then they will contact the other company and recover the cost, as far as the rental car I had one for more than a month after being T boned, never sign a check from the other persons company, the letter will say this is your first payment we will follow up soon and make sure everything is complete! Then right under the endorsment line on the check in very small letters that nearly match the color of the check that says by cashing this instrument you agree to the settlement you have just recieved and release our firm and client from further action.