If running iOS 13, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account.
If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account.
3 replies
Thanks, it resolved now.
You are welcome.
Suddenly I saw some calendar events created for next 3 days and unable to remove those