Well I managed to get through to IRCC this time, but it took 24 minutes in the queue. Well it said 24 minutes, it was actually 18.
Got the same as someone upthread, he said it was definitely sent, and on Jan 14th. I did not get it, I checked my spam folders and have whitelisted all known IRCC addresses, and got other emails that day. I also work in IT.
Anyway, he confirmed the date, time and address and is going to email me the details but can't re-send the notice, said they should be okay with that (I really hope they are!)