i have a reservation with the hotel to celebrate m...

i have a reservation with the hotel to celebrate my anniversary and choose Spencer hotel due to its location and reputation and was disapointed from what i actually heard
due to personal reason's i wanted to only amend my check out date as i have to leave earlier then expected , called the hotel and was surprised that they were unable to change my checkout date in order for them to grantee the payment .
Im an active traveler and hotel stayer , this was surprising that they rejected the idea and haven't even given an alternative solution
THANK YOU