Calendar hacked

alivia212 Said:

"Calendar hacked: My calendars been hacked it’s all filled up with scams"

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Provide Apple Feedback:

Do your Part. Seeing similar posts, this seems to be a common issue, inform Apple of this bug - Apple won't get back to you directly, but the more feedback they receive on this bug, the more they will know what bugs are occurring and what needs to be fixed.

How to Give Feedback:

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for "Feedback Type"
3. Comment On: of when you came across this issue, and how you have troubleshot it this far.
4. Proceed from there as necessary

Are you seeing something as shown in pic below?

Then probably you have accepted an offer or subscribed for a spam Calendar accidentally. Watch the GIF below to know how to unsubscribe from these alerts. Look for an unknown Calendar on the device under subscribed calendars.