Hyatt Regency Denver at Colorado Convention Center

I authorized HYatt convention center in Denver Colorado to charge my credit card $They charged my card for $On August 1, When I called them to correct it, they told me the $was the proper rate, and they couldn't change it I sent them an authorization form for $only, and don't see where they get the right to overcharge me

The guests card has been refunded as of this morning 8/by Assistant Front Office Manager ***He has been contacted about this refund and should see it shortly on his card statement