I picked up my order but a refund was made

I made an order for pick up, on the day the products were available on the store I picked them up. Days later, I received a message from Apple saying my order was still available for pickup and that it would be canceled if didn't pick up before X date. When that day came, the order was canceled and they gave me a refund. But I have the items on my hands and the money was returned to my credit card. How can I let Apple know that I picked up my order and they made that refund by mistake?

Thanks, I'd really appreciate some orientation on how to proceed.