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@acdc9 wrote:

Hi most covered all i want to know is what i did wrong or who did wrong the how to avoid in future or was it just fait.

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By mentioning the Royal Mail card in the case you caused confusion. The buyer believed you had either received the item back or were going to receive it back; when they appealed the original case decision eBay sided with them based on what you had posted in the case.

What does Royal Mail's tracking state about the item you sent to the buyer? You might be able to appeal eBay's decision but if you do you will have to be much clearer in your appeal than you were in the case and in this thread.