$713? That's a deal!
I too somehow left the AT&T Store with an iPhone without the required data plan. Once I realized that I was going to be charged for data overages (which came when I received a text message from AT&T weeks after my purchase saying that I had 24 hours to add a data plan or they would do so for me), I immediately got on the phone with an AT&T tech. He noted that there was nothing that *he* could do about the problem, but he would notify someone above him & they would get back to me.
A week or so ago, I received a message from someone who works on the "upper level adjustment team," and was told that the problem was being looked at & would be taken care of. Two days after that, I received a text message asking for me to give AT&T two more weeks to process the "account review," and that they would get back to me. This is where we currently stand.
My bill as it stands right now?
$4,758.58.