I can’t get spam from my calendar. Nothing is working
How to stop it from happening again
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You stop it by not allowing web sites to send notifications.
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.