woodforest bank disputed trasaction of withdrawal of funds from atm machine houston, Texas

10/02/12  i went to  get mony out of my account at woodroest bank atm.. i pressed the button for that amot.. i stood there waiting. it gave me 20 bucks. not the 200 i asked forr. i showed the manager in my hand the 20 dollars i recieved and not $200.oo. Sh eopend the machine and checked and sid that i had recieved $200.00 as thats what appeared after checking the machine. i then filed a complaing ordispute over the trasaction. She wais it would take up to 10 days.. exactly 10 days afterwards. today 10/17/2012 i got the report back saying they had reviewed the case and see that i had withdrawn 200 dollars.. Where did the other $180 dollars go? i stoon next to the atm. i could see it. i never put my  hands in my pocket. i held out and up the 20 dollars i recieved.. How is this possible? i need help.  200 dollars is a lot of money to me