I fly through DCA a lot. Pre-COVID I flew through ...

I fly through DCA a lot. Pre-COVID I flew through DCA on average one week out of the month in not more. I also park my car there every time, which adds up very quickly. I had just flown out and parked for 11 days, and when arriving at the airport was directed from economy to garage parking. Upon return from my travels I was surprised to see my receipt charged for considerably more than expected. Here I had been charged at garage rates, which conveniently went up on 1 Sep. How on earth can they mandate parking in one area only to up the charges simultaneously? Got me good this time, but it won't happen again. Crooks.