Failure to return a questionaire concerning insurance matters by hospital personnel ordinarily does not lend itself to a legal action where one's credit score has been damaged under the law. However, you should set up a face to face appointment with the accounts receivable at the hospital with respect to your bill and the problems the hospital's staff have caused you with respect to the questionaire.You might also consider consulting with an attorney that practices in the area of consumer law about possible remedies that you may have over the situation you have written about.