Deleting Spam events messages appearing in Calendar
I have received a number of Spam event messages in my calendar. Similar to Spam emails saying we have package delivery for you and need you to confirm detail. All from same address. There is no option to unsubscribe or delete and it does not appear in Accounts when I go thru settings. Tried declining but get error message saying decline could not be sent. Any ideas on how I might delete these messages and stop then recurring.
iPad Pro, iPadOS 16