Complaints about VIP program of Hilton Grand Vacation Club

I accidentally fall into this trap and signed the contract of this VIP program in Dec 2007 when I attended a timeshare talk at HGVC in Las Vegas. They offer me to go to one of their resorts for a week for ~ $1700 within the next 15 months. At that moment, I thought it's just like to plan a future vacation with the hotel company but I wasn't aware their cancellation policies which the staff didn't go through with me. I paid them in advance by credit card and only found out about a week later that I can't cancel it even though I haven't made any booking yet. They said according to the contract, they have to charge me $500 dollars for the cost. I have never heard about someone paying a cancellation fee $500 of an unconfirmed vacation. I think it's one of the way HGVC make their money. I would like to complain about this but doesn't know where to go. Does anyone has any idea or recommendation ?

Never buy Hilton ownership. Units are conveniently never available, and EVERYTHING requires fees. They nickel and dime you on everything. I've had my ownership for 2 years, and have never been able to use it, although I've tried on at least ten different dates!