Shamrock Parking

I called to find out the charge for parking at the JW Marriot location and was told one price, $20, but was charged $
On April 2, in the morning I went to an event at the hotel, AWP Writers Conference, and wondered what the charge for valet parking was (as usually it's cheaper when you are at an event.) The day before I parked elsewhere so knew I could get parking for around 15, so was just checking I called and was told it was $Later, when I left, I was told it was $I complained to the woman, Jessica, who said thats the charge with no validationI said I wasn't told I needed that, (I had my event badge around my neck and a bag from the event so clearly had gone.)
I paid, because I wanted my car, and she was telling me that was itI drove away and then called and spoke with Richard, the manager, who said he couldn't give me a refund but to call on Monday and speak with Sonia Castro in the officeI called twice on Monday, and finally got Sonia who said she could