Popup ads on lock screen

Lately popup ad messages appear on my iPhone’s lock screen. They have the same format as alerts from my software but when I open the phone they are not in messages. I have turned off Personalized Ads in the Apple Advertising setting, but that hasn’t stopped them.

What else can I do to stop this?

iPhone 14 Pro OS 17.7

Spam calendar maybe? If that’s what it is, see Delete spam calendars and events on iPhone - Apple Support

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If you could take a screenshot of one of the alerts that would help us diagnose the problem.

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