This is not ebay here, we are ordinary members like you and have no access to your account or previous user names.
If you mean that your friend accessed your account and made alterations, how did they access it? If they used your password and login details you are responsible. You should change your password immediately.
To speak to someone at ebay use this link:
eBay Customer Service
The best time is just after 8am in the morning when they first open.
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