My ex made a Spotify account using my email and now I can not connecty Spotify account to my Facebook account because it uses the same email. I deleted the account but I am still prompted with a message that says my email for Facebook is already linked to a Spotify account.
Could you try clearing your browser's cache/cookies, refreshing it and try it again? It would also worth a shot trying from an incognito window or a different browser.
If it doesn't help, our Accounts team can take a closer look at this. You can get in touch with them from any of our social media help sites: @SpotifyCares on Twitter and Spotify Cares on Facebook. Just send them a private message with your account's email address and username.