Rejections and waitlists are notified by email. Acceptances, however, are typically notified via a phone call, followed up by an official email.
The decision dates (interview and final decision) on the INSEAD website are the latest dates you can be notified. But INSEAD usually starts notifying around 10 days before. This is why you saw people already reporting getting the call this past week. Among my clients, the first one to get the call did so on Wednesday (March 11th).
Calls will be made daily until the very March 20th, and the timing of your call is no indication of how much INSEAD has liked your application. So hang in there.
heretofindinfo
On the website it says decisions will be communicated over email by 20 March for round 3. Should we expect to hear during the coming week, or does that mean most offers / rejections are communicated on the deadline itself? Does not receiving communication earlier in the week indicate a rejection is more likely...?
(Also confused about reports of calls when website seems to be pretty clear about email?)