AT&T has the worst customer service and they charge extra titbit's/charges on each statement hoping customers won't notice or take the time to call. When you do call customer service they will give you a run-a-round hoping you will just go away.
AT&T also refuses to unlock phones that are no longer with their company, so that expensive phone you buy will just be an expensive BRICK when you do #DumpATT
And you will, because they SUCK!