23-03-2021 4:30 PM - edited 23-03-2021 5:05 PM
Wait until 10 days have passed as you may yet receive it. If not, open a Not Received case under the ebay money back guarantee.
If the transaction has disappeared open a case in Paypal. If you didn't pay via Paypal you will have to get in touch with ebay CS on Help and Contact.
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Ask on their Community Boards on how deal with your problem.