same boat as you almost exactly, except April 2016 applicant. sponsor status "Decision Made" but no letter ever came. nothing received after that, medicals are approved, everything else seems good, just waiting and waiting and waiting. I am starting to doubt the earlier "promise" that us 2016 applicants should be finished by the end of this year
When you click on decision made, how many lines do you see? If you have 4 lines, I would suspect a typo in the email, if not 4 lines they really haven't sent it.
1. We received your application to sponsor XXXXX on (date)
2. We sent you correspondence acknowledging receipt of your application on (date)
3. We started processing your application on (date)
4. We sent you correspondence on (date) about the decision on your application.
If you have something like line 4, it means they sent you the SA letter (typically via an email). If that's the case, it's possible that they did a typo in the email. That happened to me, but I realised they did the typo when I received my first set of GCMS notes, so I asked for the correction and it was done before they were ready to give me SA.
