I received an email from Spotify that my email address has been changed. I did not change my email address and now I can no longer log into my account. It appears my account has been hacked.
It's not cool that this happens. The best thing to do here is get in contact with the Support team. You can reach them via email here. They'll take a look at your account and help you out. If you already contacted them, make sure to check all of your email folders including Spam/Junk.