I accidently deleted the spotify app.
When I've downloaded it and logged In, it's saying I have a free account which I don't, I've had premium for nearly a year and pay every month.
On top of that, I've lost every single playlist
Welcome to the community!
It sounds like you might be logged into the wrong account. It's possible to create multiple Spotify accounts, each with their own login details, saved music, and subscription. Please check to see if you have any other accounts.
Let me know if you have any questions. Happy listening :)