You and the hospital had a dispute, and the agreement you entered in to is what lawyers and judges call an "accord and satisfaction." It is usually binding on the hospital unless you did not make all the payments or breached some other term the hospital considered important.
A letter from a lawyer attaching both a copy of the agreement and evidence of all your payments should make them go away.
Answered on Apr 21st, 2014 at 11:08 AM