Direct TV cancelled

I called ATT to cancel our ATT internet and DirecTV cable Feb 17th, 2024.  The ATT Rep told me there is no pro-rating so if I wish I could continue ATT to its Feb 23 cycle and DirecTV to its March 2nd cycle.  I said great, do that.  (I forgot to ask about removing my cc on file and auto pay). The services both shut-off like clock work. However my bank acct cc incurred $82.62 debit on Match 2nd too. It pended til today and then processed. I called ATT/DirecTV today and was told that my TV service was/is billed in arrears. ( I don't think so. In fact Google brought me to this forum where stated above "you don't pay  after, you pay in advance...") . The Rep did nothing and insisted I was wrong.  Even though the $82.62 was only for DirecTV and nothing for ATT. She said  that was because ATT you pay in advance and DirecTV in arrear.  Again I don't think so. Also n the 2nd I did go online and noticed my autopay and card still on file. I removed them. Tonight the Rep said they were still on file and she'd remove them.  She promised. I am very cordial  but ATT or  DirectTV owe me $82.62 for the month they stole.