Hey @Phily91, thanks for writing!
According to what you're letting us know, it's possible that you have more than one Spotify account associated to you. If you'd like, you can find some useful information on how to locate additional Spotify accounts on this page.
Once you've located the other account associated to your email address, our best suggestion would be to close it following the steps you'll find here. You'll be able to make the changes on your account as soon as that's been taken care of.
We hope this helps. Have an awesome day 🙂