How do I claim my page if it reads as "page already claimed"?

From https://help.imdb.com/article/imdbpro/manage-your-imdb-page/claim-your-page/GXWAJBBV8EVPF3PE#pageclaimed:

It says my IMDb page is claimed, what can I do?

If you've received a message that your page is already claimed, it's possible it's claimed with a previous membership or someone claimed it on your behalf like your agent/manager or family member. If you added the photos displayed on your IMDb page, it's likely the alternate membership belongs to you.

If you are certain you didn't create the membership claiming your page and you're unable to determine who did, please visit the Contact Us page while logged into your IMDbPro account and select IMDbPro member > Claim your IMDb page (if you are logged out of your IMDbPro account, please select IMDbPro member > Other IMDbPro member issues > Other payment issue), then select "Email" and let us know how we can help.