10-02-2021 7:41 AM
By mistake, do you mean you now wish to keep the item? Do not close the case for any reason or excuse the seller is giving, you if you wish for a refund, let the case run, and escalate on day 4 f not refunded beforehand.
If this is a new seller, they need to contact Paypal to release their money because their customer, you, need a refund.
if you have decided to keep the item find the case in the Resolution centre, and close it there. You will not be able to open another for that item, with eBay.