Orbitz Charged Cancellation Fee Contrary To The Ad.

I booked a hotel reservation on 11/26/2009 for three nights for $297.12 charging it to my AmEx, for my stay at Holiday Inn Exp. in Simi Valley Ca.  On 12/03/2009 I cancelled, noting that Orbitz does not charge canceellation fee.  Today I called their 888-656-4546 to ask for refund, and was told that the charge was non-refundable.  I complain that their statement was grossly misleading, when they say no cancellation fee.  I checked with the hotel management directly, and they assured me that there is no charge.