I WISH! I'm an employee and called them before and they actually said "you're an employee, you should know we can't do that". Do you have the ROGEMP tag on your account with the half-off discount?
And yeah, we do have Retention's number in the store but we are very selective about who we give it to. Besides, all it takes is telling the main customer service number that you want to talk to the retention department and they'll transfer the customer right there anyway. It's not really a "special" number you've got there.
And that's also not true about family plans. I just upgraded two at once the other day. They changed that awhile ago.