Every figure on this page is copied from a printed branch menu. Three details decide what you actually pay, and none of them is obvious from the number alone.
VAT is not on the same basis everywhere. Al Barsha and Bur Dubai print prices before the 5% and add it at reception, so 400 AED is 420 at the till. DIFC prints the figure with VAT already inside. Each card above says which applies, because comparing the two as if they were the same number is the easiest mistake to make here.
The start time changes the price. Anything beginning from 10:00 and before 15:00 is charged at the Early Bird rate where the treatment has one. It is not a code or a voucher and there is nothing to claim: it is decided by the hour the treatment starts, not by the hour you booked it.
DIFC sells things this page does not list. That branch runs its own menu, and 6 of its treatments have no page here: Balinese Massage, Couple Massage, Back, Neck and Shoulder Massage, Moroccan Bath and Classical Swedish Massage, Moroccan Bath and Deep Tissue or Balinese Massage, Private Jacuzzi. They are printed in full, with their own durations and prices, on the DIFC branch page.