Fees not communicated

I have been an AT&T wireless customer for over two years now, and have been generally pleased with the service I have received. I have been so pleased that I recently added my fiancée to a family plan with AT&T. We went to the store in Willow Grove Park mall in PA. When we purchased her phone, we were not informed of any activation fees, or fees for adding phones to the new plan. So when I received a bill over $100 more than what I expected, I was shocked. I was not informed of any activation fees, or one time $40 fees for adding phones to the new plan, including the phone that was currently on AT&T's service. I was not able to easily view the fees on the AT&T wireless website, and the only way I could find out about them was a 20 minute phone call to customer service. They were able to reverse the activation fee on the new phone, but I am still left paying $80 in fees I was not informed about. As a couple getting married in two months, every penny counts to us, and $80 is a lot of pennies! Again, these fees were not communicated to us at the store. Like I said, I have for the most part had a good experience with AT&T, but having to pay $80 in fees that were not communicated hardly seems fair or right to me. As someone in client service myself, I know what good service means to a company, and I am severely disappointed. 

Thank you in advance for your response.