petro i go to this store on daily base. and he are cheating peolple out their money with atm machine opelika, Alabama

I go to Petro service station almost everyday. I seen at least 3 people using petro atm machine those three people were shorted alot of money like 100s of dollars he tell them some wrong with their cards, call the atm customer service. Most atm machines in stores i see them put the money in the atm machine. Today 12/20/2012  i went inside of the store and this girl was using the atm and she wanted 40$ the machine gave 20$, he argue with her laugh at her, told her she didnt have enough money on card her balance was 545.00$. I dont know why she did this she tried to get another 20$ out the machine do anything anymore after she swipe her card i got all her infomation if needed. Please check into this, this is a very serios problem he are cheating people out of their money. thank you