How disable suggestions for calendar events in mail ios 9

Hi, I am seeing popups for suggestions to add events to my calendar in mail for iOS 9, but I have already disabled the switch for this.

In Settings, under "Mail, Contacts, and Calendars" I have turned off the last switch, "Events Found in Mail" However I still see the notices on some of my emails suggesting I add events to my calendar. How can I get rid of these?

Thanks