I've never been to platinum spa before, but it doesn't seem uncommon for some MPA's at the same MP to charge different rates for the same service. It's happend to myself but at what appears the be at the 'lower quality' MPs. I can't comment on the quality of spa that platinum is, and do not know if this is a common occurance there. But to avoid the uncomfortable situation of getting charged more then expected, it's always a good idea to get the costs out of the way before the act has been performed.