So I let Hilton have some time to respond (nothing), I don't have twitter so didn't use that route, but finally decided to call the hotel and speak to a manager. She apologized, saying the ball was dropped, wasn't even sure that Amex spoke to the hotel, and said she'd take care of it right away.
Hopefully it is taken care of. But I feel The Hotel Collection is a far inferior program and should be used with caution, as compared to Fine Hotels and Resorts.