Nie dawno dostałem wiadomość o wirusie i że mam zapłacić 47,99 zł żeby usunąć wirusa

(English, sorry)

Just a scam, ignore but remove the

Calendar spam

In Calendar app, tap on Calendars and uncheck the ones you don’t recognise .

Then in:-

Go to Settings, Calendar and look in Accounts 

(iOS13 and earlier Go to Settings, Passwords & Accounts and look in Accounts )

And in either case see if a strange calendar is listed. If it is then tap on it and tap Delete account.