Received an upgrade

Everyone, please be careful with the Budget car rental store. I've rented cars many times, and this is the first time I've encountered hidden charges that I was unaware of, which were forcefully added. I've applied for after-sales service, and a week has passed with no resolution. Where is the efficiency?

The attitude was average, they kept trying to get me to upgrade the car. I suspect the car I reserved wasn’t available. In contrast, big companies like Enterprise would directly upgrade the customer.

Everything else was excellent, the only issue was because it was raining. The store manager suggested we upgrade the car from the convertible we initially booked to a Jeep SUV. However, when we got to the parking lot, we saw the Jeep was also a soft-top and quite small. We went back to the store to request a change. Since the pre-authorization was already done, the manager tried to say there weren't any cars like the one we originally booked and suggested another upgrade. I mentioned I saw plenty of the original cars in the parking lot, but he insisted they were all reserved. Finally, I said if we didn't get the car we originally booked, we wouldn't rent from them. Only then, reluctantly, did he agree to give us the car we originally booked. Despite this, everything else was great; the rental point is conveniently located from the airport, return was quick, and the car was in good condition. However, it seems rental companies tend to mislead Chinese customers into upgrading. Hopefully, this can be improved in the future.

When we arrived at the store, there were no cars available in the group we had booked. Without asking, they upgraded us to a different model that was in a higher category, and the price doubled. After negotiating, they finally compromised, and we had to choose a model that cost twice as much. They said it was the cheapest model they had available, and there were no other options. Our original estimated cost was $300, but it ended up being over $540. If we hadn't negotiated, the quote they initially gave us was $750, which was really frustrating.