The store didn't have discount during the May day event

Dear OR team, I recently bought some OR-bucks on your store website during the may day event on the server, the store suppose to have discount on them during the event. However, the website did not refresh and I still spent approximately 64 USD dollars for 5,500 OR-bucks (I bought 2x 2,750 one), it should have discount sale on the event, Is there any ways to resolved this?