A few weeks ago I have made a resevation for 5 nights at the end of November at a Hilton at the "Best Available Rate" of $109. While browsing the beta.hilton.com site I just noticed that the best available rate for the same room type and dates now is $99. This rate is also on the real hilton.com site.

Is there an easy way to get this new rate or do I need to book another room and then cancel the old reservation.

I have become Gold since the original booking, if that matters.