Dear CEE,
How frustrating and disappointing! As I mentioned before, I would not let BC's opinion influence how you feel about your chances at other schools. Schools have different goals for their classes and you just never know how it is going to go. In terms of what to do for BC, I think the only thing you can do at this point is to submit a letter conveying your desire to attend BC and why. While it will be a little redundant to your application, try to get into more detail as to why the program is a good match for you in terms of curriculum, career opportunities, culture, and resources. Other than that, you are unfortunately going to have to just wait it out.
Best of luck,
Lisa