We do not refund any items purchased from the store. 
Exceptions to this can be bugged items and/or items that are not working as intentional.

Gold purchase refunds have to be done via customer support found HERE 
To be eligible for a refund you need to make sure the full gold amount is available on the account and that you request a refund within the first 14 days of the purchase. Partial refunds will not be processed.