Calendar Alerts Will Not Change or Turn Off

Hi sjj7552,

For help with calendar notification alerts, check out the information below found in the article here: Keep track of events in Calendar on iPhone - Apple Support

"Customize Calendar notifications

1. Go to Settings  > Notifications > Calendar.
2. Turn on Allow Notifications.
3. Choose how and where you want the notifications to appear—for example, on the Lock Screen, in Notification Center, as banners at the top of the screen, with an alert sound, and so on."

There's additional information in the same article to change custom notifications. You can also check details for your events with the help of the guide here: Create and edit events in Calendar on iPhone

You can also ensure that your iOS is fully updated with the help of the information here: Update your iPhone or iPad

If the issue continues, reach out to Apple Support directly to further assist.

Contact - Official Apple Support

Contact Apple for support and service - Apple Support

Best.