I did not have mine connected to facebook, but I complained enough to Zoosk about how bad a site it was and complained on this site, they were happy to get rid of me. Turn the picture around.

Yes i know u can't delete them, my friend her husband is still there and they have been married for years. There is a guy on there he doesn't even live in this country and he is still on there after i turned him in, he is a scam and they still didn't delete his profile.

I think it's better remove the authorization that eventually you've gave them, then delete your picture(s) and delete all details of your profile, as if you've decided to change your profile. After that, delete your subscription! Finally, open your facebook page, go to the setting, then notifications... app request an activity... and turn it off.
You can searche your question in Google, for other suggestions.
Good wish...