Unfortunately is not stolen. You let it expire, so was publicly availabale again. Anybody could purchase it.
You should have recieved news about expiration and the ending of the grace period.
If your site is your name, maybe icaan can help to recover it.
Finally about your content, if it reproduces exactly your content you can reclaim to stop using it, but if they only wanted the link, well, this is not copyright protected.
For further actions, you may consider blocking this person and/or reporting abuse
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Unfortunately is not stolen. You let it expire, so was publicly availabale again. Anybody could purchase it.
You should have recieved news about expiration and the ending of the grace period.
If your site is your name, maybe icaan can help to recover it.
Finally about your content, if it reproduces exactly your content you can reclaim to stop using it, but if they only wanted the link, well, this is not copyright protected.