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We advise you to try and reset your password. You can do this here. If you're not sure about the login email address, it's a good idea to try with all addresses you use or your username. Afterwards it's a good idea to go ahead and secure your account using the instructions in this Support Page.
Don't forget to change the password for any service associated with your account, such as your email address, Facebook, or Apple.
We recommend that you also have a look at all third party apps that have access to your Spotify account and remove any you don't recognize. You can learn how to do this here. For the other ones you should update the login info as well.
Hope you find this useful. Let us know how you get on.