Enterprise Rent a Car Asking for me to pay for damages I did not cause Philadelphia Nationwide

I rented a car from the Enterprise on Norcom Road in Philadelphia on Monday morning.  First the women at the counter was very rude to me when I found out my debit card could not be used.  She was very condesending and said that they called me and told me what I could use.  Thing is that they didn't because I placed the order online.  Next she summons the guy to check the car.  He just walked in the door and looked like he just woke up.  He did a once around the car and it did not look like he wrote much despite all the things I pointed out to him.  I brought the car back the next day after taking it to work twice and the original girl went out to examine the car, she noticed a crack in the back bumper that was about an inch in diameter.  She had to point it out to the original guy before he even saw it!  He said the scratch was not there the day before despite the fact that he couldn't see it.  He even gave me a hard time when I asked him if he wrote anything about the back because I told him I saw things.  He then proceeded to call me a liar in front of all the other customers.  I am more than willing to pay the $20 it would take to epoxy the small crack and be done with them forever.  They, however, want my thousand dollar deductible for soemthing that will not cost anywhere near that.  I find it appauling that their employees act and treat their customers this way and part of me thinks they singled me out because I gave them a hard time initially.  The girl remembered me and spent a good ten minutes outside as if she was looking for something to get me on.  I should not have to pay $1000 dollars for a crack that size that I did not cause.  I am shocked by my treatment by Enterprise and want to know if there is anything I can do to just get treated fairly and not called a liar by Enterprise emplyees in front of a group of stangers over and over again.