Oddly enough, I underwent a strikingly similar experience not long before yours, only I was asking some rather pointed questions of the INS...
Apparently, the were quite unwilling to reply with any exact answers. After determining that I was determined to get specific details on their official procedures, rules, and regulations they decided to abruptly end the phone call.
Quite abruptly.
Well, I see that I am not alone!
Hrrmph!... Apparently “they” were, not apparently “the” were.
Typing too fast. :)