Welcome to Spotify Community and thanks for reaching out here!
Probably someone has taken over your account, so first of all, you need to follow some steps to keep your account safe. Take a look at this article:
And if your playlists were deleted and you want to recover them, you can do it through your account page. Take a look here to see how it work:
If you have any other further questions or need more help, let me know! I'd love to help!