On 1/7/21, I prepaid $586.67 for our reservation for a minivan to pick up at RSW Airport on 3/12/21 at 1:30 pm, drop off at RSW on 3/20/21 at 1:00 pm. On 3/2/21, our flights changed so I modified the pick up time to 3:30 pm and drop off time to 3:00 pm. I didn't change dates, type of vehicle or duration of rental. I immediately received an email reflecting our rate changed to $1, 057.44. The Budget website clearly reads: "With Budget, you can change most things on your pre-paid reservation on budget.com or at the counter any time, even multiple times, with no fee. If changes affect the total rate of the rental, the prepayment amount will not change." I called Budget immediately and was told they cannot honor the original total. She said I could send any screen shots I have to their document site for review. I did so and heard nothing. I also submitted an inquiry online and received an email back saying it looks like issue was resolved as they cannot honor original rate. I was concerned with our flights changing they would give away the vehicle if we didn't show at 1:30 so I updated it and now am expected to pay an additional $470.77? Being our trip is next week, I am unable to find any rentals near what I originally booked it at. This practice goes against what their website states.