Refund for a payment i never received.

a customer from the states bought a steelbook from me for eightypounds after a couple of hours the same user asked if i would could cancel the original order and make a bundle instead which i did....but a refund has been taken from me for eighty pounds  when i never received the money in the first place. because i don't get payouts withen two hours so i am a lot of money down and i am just wondering how do i talk to ebay to fix this. any help would be nice 😞