Hi.
Battlechest is used to be 14,99€.
Now its 7.50€.
I bought battlechest yesterday for 14,99€.
I made a ticket and asked if i could get refund (the 7.50 i payed "too much"). They told me i can get the money back in play time, so i got free play time.
(I bought battlechest + MoP + WoD preorder), Since MoP is cheaper too, i got "my money back".
in the end ~24 days free time. very nice from blizzard and worth a try to ask them
i still have everything, i just got the money which i would have saved if i bought today back as played time.