I'm not sure if it's just Bell or if others will be dropping Sundance Feb 28/18.
I'm not sure who owns Sundance but I haven't seen any press release regarding Sundance shutting down? :surpriseNote - As of February 28, 2018, Sundance will no longer be offered in Canada by the content provider and therefore will be removed from your programming. If you have it through custom pack, we will add a replacement channel that you can change any time. For questions or if you wish to add, modify, cancel or extend your services, please call 1 866 310-BELL.