Today AT&T decided to call me to harass me for an overdue balance.  You mean the one that I've called you about several times in the past month?  The one that should have processed to my credit card last month because I've been enrolled in automatic payment, but YOU didn't charge the full amount to the card?  The one that your representatives assured me was NOT an issue that it would be fine and cleared up with the February charge?

Seriously, get your sh*t together.  Harass someone who hasn't bothered to pay their bill for a long ass time rather than someone with along track record with you and DOES pay their bills (without government assistance).