Got logged out by no reason

[LivAderssonAira]

Hi! 
While teaching danceclass today, Spotify logged me out from a premium account I had for almost 10 years. I know the username and password is correct, but it does not allow me to log in again. Spotify charged me as usually 18/02/18. The account is so old that its no active email connected to it. If i turn off WiFi on my comphuter I can log in and find all my offline playlists again. But with Wifi on Spotify tells me that my account do not exist. 
My username is LivAira, I can see it exists from other peoples accounts.