I bagged a very low rate via Net Direct for a Thursday-Sunday stay I'll be having in ATL in 2 weeks. On the last page before committing to the price it gave me the total which looked about right, including the taxes. I didn't take the time to do the math to verify. After I accept, however, it shows that the Friday and Saturday rates will be $24/night higher than the Thursday and Sunday nights I've reserved. There was no mention of that little detail before confirming the sale. I had to make a series of phone calls and this is the way the different reactions went:

Net Direct 800 #: Sorry, there is nothing we can do about, no refunds
allowed.

Diamond Desk: Sorry, there is nothing we can do about it, Net Direct is a
totally different entity over which we have no control. Let
us transfer you to Corporate.

Hilton Corporate: Sorry, we can't make any adjustment either, but let us put
a call in to the local hotel management to see if they'll
make an adjustment.

Local Hotel: No problem (Finally ^ ) we'll make a correction to your CC
and you'l get the lower price for all 4 nights.

Moral of the story (as has been illustrated many times on FT): Don't take the first, second, or third 'No' for an answer. At least for me it finally paid off in this instance.