go to the website ( I still type in cingular.com and get redirected..lol)
FAN discount name and # in top right corner on your account summary page
I think looing at your actual bill online will show your discount..under 'Total Usage Charges' and might be called 'National Account Discount' (thats what mine is called)
As far as online rep--I don't think there is one? not for like a live chat. here's a link for email, phone and find an att store
Edit: I see above the link was put for the livechat..forgot about that Thread. Thanks Desibhar!