Make sure you are logging into the correct account. Also try reinstalling the Spotify app.
Read this post for troubleshooting steps and how to contact support if the steps don't work https://community.spotify.com/t5/Help-Accounts-and-Subscriptions/Please-read-Missing-playlists-Premi...
To find out the username of your account, enter your email address on this page:
The email will include your username and link to rest your password if necessary.
I suggest you contact support so they can help you https://www.spotify.com/about-us/contact/contact-spotify-support/
If you get an automated reply email telling you to check the help section or the community, you need to reply back to it, even if it's from a no-reply address.
Support usually replies within 24-48 hours.