Excellent

It's okay.

After experiencing a flat tire, I contacted multiple times but the issue was not resolved.

Unreasonable charges! They can charge you even after the pre-authorization period ends. When we picked up the car, they tried to charge us for an upgrade saying the original model wasn't available, but we refused. Besides pushing for insurance, there are additional charges that they insist on. Returning the car is a matter of luck as locations are hard to find. Even months after the pre-authorization ends, they can still charge your credit card with no email notification. They claim it's a fee for checking if you violated traffic rules, and explain it took a lot of effort to verify it was your violation, hence a $500 fee. This is separate from the actual fines.

The billing issues are not very clear.