Hello Mari,
Looks like you haven't updated your postage address in your 'profile' ....
First thing to do is update yourself. 😊
On your 'my ebay'/ summary page. on the left near the top is 'activity, messages, account'.
Go into 'account'.
From there go to 'personal information and privacy'.
From there go to 'addresses'.
Then message your seller (of the item that's gone to the wrong address) and tell them what's happened.
The parcel *should* be returned to them, and they can then send it out again to you.
If they're feeling generous (and the postage is cheap) they might send it immediately. But if not you should offer to pay postage again ...as unfortunately, this was your own fault ☹️
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By the way; you're not talking to ebay. This board is full of other members, just like you, who come here to help out😁
If you'd like to contact actual ebay customer service, try this link ;
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
(Also, be prepared to find most of your opening post vanishing soon; the mods tend to remove personal details like addresses *off* the forums)