That's a big flaw on ebay.
You can do a mutual withdrawal (something I always insist on before a refund is given) to cancel a transaction, But they can still leave a negative.
And for non paying bidders, as long as they reply to the dispute (even something like Get lost I ain't paying) they can leave negative and ebay won't remove it.
If you are going to refund, always do a mutual withdrawal to get your fee's back!
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