You open a not as descried dispute by going to the item in your Purchase history or ebay help at the top of the page
If the seller does not send a pre paid label then you go back to the dispute after a couple of days and escalate to ebay
That option appears when it is time.
It says the item is in London and that is where it goes back to not China
you have 30 days to open the dispute so if you did not and still in time do it now.
You dont have to deal with the seller
Did you open a dispute?>
If you opened a return instead of the Not as described and it closed then nothing you can do on ebay
If you paid through paypal then try there
Of your card provider
Never change feedback on a promise and as I expected your seller is in China
They will pester for you to change.
_____________________
We are just ordinary members trying to help.