ATT doesn't train personnel or just doesn't care if it costs you when they don't tell you anything

Called to cancel account after being with them many years.  Mainly due to overages each month on their other services, but cancelled them all.  Called many times and each time was told something different.  Meanwhile I'm thinking I owe nothing and then get a late charge attached because now they are saying I do owe money.  I talked to about three for four different departments several times and was always told by the end of my calls that my account had a zero balance.  Once I saw the late charge had been attached and online it said it still showed I had a balance, I called once again. This time I was told their policy is that if you cancel after the beginning of the billing period, you have to pay for the whole month. No one ever disclosed this to me when I called to cancel or, obviously, I would have waited.  All the calls I made and the last person told me, ATT paid DTV and now I owed ATT the money.  I think they should never have charged me.  My billing started the 8th and I cancelled the 9th, but paid for a whole month's service.  I am so glad I am done with them.  They have cost me a lot of money the past five or six months and they could care less about their customers.  I am going to research further on their cancellation policy and am going to file a business complaint about it. I will tell everyone I know to stay away from them and use their other options.