You're not a bad person for making the reservations, but if I were you I'd get it in writing that they'll actually honour that price. They do have a disclaimer on their website:
"SIX CONTINENTS HOTELS, INC. FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS, LINKS OR OTHER ITEMS CONTAINED WITHIN THE MATERIALS. SCH MAY MAKE CHANGES TO THE MATERIALS, OR THE PROGRAMS, POLICIES OR OTHER INFORMATION DESCRIBED IN THE MATERIALS, AT ANY TIME WITHOUT NOTICE. SCH MAKES NO COMMITMENT TO UPDATE THE MATERIALS."
Which basically means they can change your rate/reservation at any time if they feel like it, especially true if there's been an error.
Nothing like expecting one thing and then showing up to be told either that your rate isn't valid or your reservation was cancelled because the rate wasn't valid.