this is the very ture reflection of the business world. if you are admitted, the letter warms your heart. if not, you feel like they are dumping garbage.
Really? Sorry to hear that. Can I ask what kind of questions you asked? Are you sure you sent it to the correct email address? According to my experience, they were very responsive.
The AdCom in UT has students to work for them and help process the applicaitons such as answering emails from prospective students. Probably there won't be very prompt replies coz Adcom is actually understaffed especially during the peak season. But they are usually responsive. It might have been your bad luck.