What do I do now?

I sold an item and was paid, then I shipped the item. Ebay now informs me that they are cancelling the listing.  I cannot get the package back as it is now in the US, what do i do now.?

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Sorry my question might have been misleading. It was not the customer cancelling the listing it was ebay , but why? they have all the info and know that the item has been shipped.