Unsubscribe from digest not working

I have, supposedly, unsubscribed from the new Duolingo digests at least twice, but they still keep coming. How can I get them to stop short of filtering my email?

March 8, 2017

March 9, 2017

Thanks. For whatever reason Duo didn't give me the option of posting to the Troubleshooting forum.

March 9, 2017
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