On 21 April 08 my wife and I attended a time share sales presentation at Coral Sands Resort, Hilton Head, South Carolina by Hilton Head Guest Services. We had purchased a prepaid vacation offer for an agreed price of $100 on 2 Feb 08. I gave Hilton Head our credit card number and authorized them to only withdraw $100. We attended the sales presentation but were not impressed nor did we buy. Later we discovered they had resubmitted an additional service fee of $200 and they have refused to explain what the fee is for.