Situation is my contract was up April 17, 2014 and I switched to AT&T Go Phone plan. Now around May 5, 2012 I was billed and paid a partial month's service as first payment. Then I paid monthly for the next 23 months. So I should have received a bill for a partial month after I cancelled my plan.
Well the bill indicated partial charges from 3/29 thru 4/17 in the line item text, but the amounts were not for a partial period, but for a full month. See notes on attached document from my bill and prior month payment of $40.85.
I requested a corrected bill, to no avail (local store, 800 customer service #, in writing, etc... Now they have turned this over to a collection agent. Good luck with that - sue me idiots.