Seller refuses to cancel an accudentally ordered item

[oi_4917]

Was just beginning to set up an order for my sons Christmas present and looking through details and changed my mind when the phone slipped in my hand and I accidentally confirmed the order as I tried to stop it from hitting the floor. 

Went through the order cancellation process with ebay, which took minutes but have received a message saying that the seller can't cancel because they've posted  the goods. I have never had that fast a response on a purchase before. How do I cancel,?

[jckl1957]

Unfortunately, if the seller claims the item has been sent, you won't be able to cancel.

Ebay rules state that buyers can request a cancellation but sellers can accept or refuse.

If it is a business seller, you will be able to send the item back but you will be liable for the return postage.