Bell has been having numerous issue without incorrect blackouts for Sens games this year. I'm not sure if the problem is on their end or with the information fed to them. SportsNet has been great with following up when a problem is reported and it is usually fixed by game time.
However, the issue reported above sounds to me more like a promo issue. When a game is available on multiple services as indicated above, then it usually is only "viewable" on one of them. This is a regular occurance. So, if the NHLCI promo is on, they force you to watch it on that channel.