Yes, this does seem to be bugged. Yesterday they issued a "last chance" call on facebook, and restated that the offer expires on the 27th (not a new date, that has always been the expiration). Responses to it are all over the place that it dissappeared early. They did say 'if you have already logged in one day you still have time', but as it still had 9 days left I think somebody counted wrong.

I've referred a couple friends on the 'hurry up and dont miss it' basis, and they can't get it either. I'm hoping this is a bug they will fix (and tack on a couple days for those impacted), otherwise I think it's kind of unfair to end it 9 days early. Heck, even if you only caught ONE day you'd get a nice piece of regen gear for a new player. Fair is fair, the offer should be available as long as advertised. This just breeds frustration with no upside for anyone.

I'm having the same problem so I would love an update on this. My friend got me to start playing yesterday and the biggest sell from his was the free ultimate death knight. Kind of demotivating when you start playing and don't get the biggest reward you were told about.

Per the official Discord server: 

i

Wow what a scam. That's not at all what any of the ads say.......

Edit* So I'm just going to go ahead and uninstall. I wanted to start and I heard the game is massive. It's rough when the first thing they do is remove the event you chose to start for. 

Even the google play and apple store say play 7 days before the 27th to get the champion. This is a pretty rough business model. Good luck everyone else.

https://play.google.com/store/apps/details?id=com.plarium.raidlegends&hl=en_US&gl=US