Twitter reminders keep coming despite being turned off

I've set the "Would you like me to send you reminder tweets?" to off in my Settings but it has no effect. It might have something to do that I've sent the reminders through Direct Message in Twitter and not by email (which I never use anyways).

This is actually only my secondary problem. My original intent was to turn of the Twitter confirmations (not actual reminders) but there's no such an option to be found. Because I deliver my tweets to my mobile, these confirmations (for me at least) are just spam.