Enterprise Rent-A-Car

I rented a 2018 Nissan Altima on 7/24/19 at the Enterprise Location on the East Frwy. The rental agreement #6J2VQL.
This car was running fine for the first week that I had it but the following next I started having issues with it not starting. The 1st time that it wouldn't start, I called my AAA roadside assistance and the technician that came out said that the battery was corroded and that Enterprise must have not checked under the hood of this car for a long time. He said that the car shouldn't have been rented out with the battery being in that condition. I can call AAA and verify this with the technician. Anyway he had to clean off some of the corrosion in order to give me a jump start.
He told me to drive around for about 15 minutes to charge the battery and I did and I thought it was ok. But 2 days later, I had the same issue with it not starting and I called Enterprise and informed them of the problem and they connected me to their roadside assistance. They told me that I would have to pay $55 extra to send someone to help me. I told them that I would use my own Roadside assistance and they said it was ok for me to do so. After they got it started I drove the car straight back to the Enterprise location that I rented it from and I let them know about the issues that I was having with the car and that I wanted to swap cars. The employee at the counter apologized for the inconvenience and then said told me that they didn't have anymore cars available. She offered to give some kind of discount on my rental for my troubles.
So I paid for my returned car which was the 2018 Nissan Altima, and I asked if they can take me home. The Employee said ok and she went outside to see if she could start the car that I just returned, so she could take me home, and of course... it wouldn't start for her either. So she went looking in the lot for another car, so that she could drive me home. She pulled up In some other car and I got in. She started driving and maybe 2 or 3 blocks up the street, she said that there was something wrong with the tires on this vehicle and we had to pull up in a service station and she had a flat tire! I'm really frustrated now! She said that she needed to call for someone to come get us. I asked her if they had any mechanics to do regular check ups and keep up with the maintenance on their cars on the lot and she said "No". Anyway someone else comes to get us and drops the other employee back at their Enterprise location before she took me home.
So why 2 weeks later I'm receiving an email saying that I somehow had damaged the car and that a claim has been filed on me for damages. I just received another email that states that Enterprise has filed a claim with my credit card company. What the hell is going on. First of all, the claim states that the date of loss was 7/31/19 and I still had the vehicle at that time and it was running fine at that time. I didn't return the vehicle until 8/7/19, when it was having issues starting. I don't know what type of scam that Enterprise has going on, but I'M NOT THE ONE"! I have the photos of the condition of the battery and some little scratches that were already on the car before I got i! And, I'm not responsible for the negligence of your employees perform maintenance of the vehicles that they rent out. This fraudulent claim needs to be resolved immediately or I will have to take this matter to the next level.