I have a reservation at the JW Maldives in February and accidentally booked it as one person, not two... ordinarily it would not be an issue - but in this case, there is a $500-ish per person fee for the sea plane... Marriott claims they can't change the reservation or it will reprice from 340,000 to 480,000 (or something like that can't remember exactly)...

What should I do? I obviously am more than happy to pay for the extra seaplane seat, but having the number of points go up when it would have otherwise been the same seems ridiculous.