I got a message from "security-protect.systems" that says "your Apple iPhone has been hacked. All operations on your device are being tracked by the hacker. Immediate action is requiredd

HI Jonathan,

when I followed the two possible paths to deleting the calendar neither worked. In calendar there are home, family, work and US holidays. I don't use any of these but US holidays said "subscribed" under it so I'm guessing that's the one that got added. It's also the only one that has no delete button when I scroll down. So I went into settings/calendar/accounts. It's not listed under accounts but is listed in the "fetch data". I couldn't find any way to get rid of it there though.