Welcome to the Spotify community, Ivan1!
I'm not sure why Spotify may have made this sudden change unless you've moved, your regional VAT has been heightened, or because of inflation. To help resolve this issue, I recommend you follow this link to Spotify Support and click Subscription and choose the next best option matching your problem. 😉
If this doesn't resolve your problem, feel free to reply back (if it does, please hit ACCEPT AS SOLUTION)! And if you have any further questions, don't hestitate to post them on this community! 🙂