friends who have been waiting for AOR for ~2 months - I was in the same boat. My app was delivered 02 Nov 2017 and AOR came on 27 Dec 2017. I tried to call them a couple of times, but never succeed. I read multiple posts about similar situation and came to these conclusions:
- If there is something wrong with your application, it will be returned in relatively short period of time (2-3-4 weeks).
- I never heard about any real cases when the application was delivered and then lost without any trace (except of the rumours)
So, if your application was delivered, and after about 2 months you haven't gotten it returned then your AOR is about to appear in your (e)mailbox.
Unfortunately, there is a small chance that it was returned but lost somewhere on the way to your home. So, since the payment is valid for 3 months only, 2.5 months without AOR should trigger some actions. But again, I think such chances are very small