User Activity

My buyer asked to cancel a purchase. I did so and refunded her purchase price all through ebay. Had a notification that it was cancelled and refunded but now ebay says it is overdue for posting. I don't know what to do next.
I left feedback for an item (positive feedback) only to find out a few days later that the item was faulty. I would like to amend or add to my original feedback for the seller. Can I do this ?
I have returned an item to a seller not using the ebay label. On the returns details page it says I can ask ebay to step in. How do I do this please >
I returned my items to the seller after being asked to do so as they were defective.That was nearly 2 weeks ago and I have heard nothing since. The seller does not answer my emails.
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