Thank you for your reply. When I received the item, I tested it immediately and started the return process. However, I mistakenly selected the wrong reason not fit. Because of this, the seller rejected the return request.

I contacted eBay, and they advised me to reach out to the seller directly. I did so, but the seller has not accepted my explanation of the mistake. At this point, I have not received any help from eBay, and I no longer have the option to request a return.

Could you please advise me on what I can do next?