Here's what United does with calling the wrong line....most times, nothing. I had been calling the Prem Exec line (only explanation I have for knowing that number was that United called in the middle of the night last summer saying one of my flights had been canceled and to call them back, giving that number) a half dozen times and nothing at all was said to me about calling the wrong line. Then one rep yelled at me, gave me the correct Premier number and told me she'd help me this time but never to call it again..