From the forums:
As many of you have already heard, there was an unfortunate amount of mission rigging going on after the introduction of our new rampage mode. Several players that were able to acquire the new T-22sr, did so fraudulently.
We believe strongly, that fair-play is paramount in keeping our gaming environment fair and equal for all our players.
After analysis of received reports and our internal databases, we have taken action against ~100 players that broke our game rules to acquire this new tank. They will be receiving a 14 day game suspension and the T-22sr will be removed from their accounts permanently. The missions cannot be repeated, those players will never be able to earn the tank back.
The same sanctions will apply to any other players caught for mission rigging going forward.