Enterprise Car Rental Faulty Damage Blame (Gimmic) Eagan Nationwide

 First of all, I don't have a history of accident in my life. I rented the car from Enterprise in May, 2014 to visit my family. before the car was given to me, I was told to examine the car for any scratches and bruises on the body of the car. I checked every where but not the front bumper. I signed the form and took the car, drove and parked in a residential parking space, did not take the car out for 2 days. I drove the car back and after returning the car, the rental person checked everything from head to toe and tells me that there is a crack on the front passenger side bumper. I told her everything I know, and nothing ever happened. She tells me that since I signed the doc, I am responsible for it. I filed a dispute with the adjuster and trust me, they do not communicate well. They were not in mood to investigate and see if that was something that missed from previous rental. I strongly believe that it must have been be their mistake on previous rental, which they threw at me. I am fighting still with this. I am not paying for something which I did not do. Why don't THEY check the car before the car was taken out? Please be aware and check for every inch of a scratch, dents and damages. I am never ever renting from Enterprise, National or Alamo.