I wouldn't refund your moneyand hope they don't. You took their product out of inventory knowing full well you were about to make platinum and ask for your money back. Why did you do this? To secure these seats for yourself instead of taking the risk that someone else would take them before you were entitled to get them free, whether they would have paid or been allowed to take them for free. Just my three cents.
How do you know the OP knew they would make PLT when this trip was booked? I'm booking a trip for next year right now, and I don't know if I will be PLT or EXP at that time.*
I know that many like to assume the worst possible motive for the actions that others take, but unless you have some special over-the-internet mind reading powers, I don't see how you can make a logical leap as to motive of the OP, particularly since they had no knowledge as to whether they would be entitled to a refund.
*Yes, I get that it's not the same difference. The point is that you don't necessarily know your future status when you're booking a trip.