Hi,
Change your password so that the third person can't use your account.
Also try to contact eBay and email them.
http://pages.ebay.in/help/contact_us/_base/index.html
I think you need to fax the address proof of yours (ex: Election Card, Driving License or Phone Bills).
Don't worry and fax them. Your account will come to normal.
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With Regards,
Navaneeth (snrama)
😉
---------------
With Regards,
Navaneeth (snrama)
😉