Enterprise Rent-A-Car review: being made to pay charges that aren't my responsibility

I am an Us Airman on active duty. During the month of August 2015 I was visiting home on a short leave. During my visit I rented a car from Enterprise. One of those nights using my rental I went to visit a friend at his house. Unfortunately that night, my friend's dad not noticing my rental then backed into it causing a dent a scratch. My friend's dad immediately knew he was at fault and said he would have enterprise report it to his insurance so he could cover the damages. That night we called the police and had an accident report made. Then the very next morning myself and my friend's dad went up to the rental location ( 4509 TAMIAMI TRL PT CHARLOTTE, FL [protected]). We explained what happened, gave them the accident report, and my friend's dad gave them his insurance information. The agent then took photos of the vehicle and told me that the report and all information would be submitted. Fast forward three weeks later im now out of the US on duty & my mother emails me a week or so ago to let me know Enterprise has mailed a letter saying I owe $1, 066.88 for damages. How is that possible when I was not at fault in the accident and from my end all the proper information was submitted. Im baffled and extremely annoyed with Enterprise at this point.

Information:
Claim no. [protected]
Date of Loss 8/9/2015
Balance Due $1, 066.88