Thanks for sharing your experience on them. Until reading your post, I'd only heard good things about them. I hope that your experience was rare, but this will definitely go in my "mental file cabinet". Thanks for sharing!
I think it's a major red flag that you can't even get a response back from them. I'd proceed with caution because if it's hard to just get them to answer some basic questions, I'd have serious reservations about enrolling.
Good luck in whatever you decide!