"How Do I Track A Fraudulent POS Transaction?"

On the 6th of January, the sum of Twenty Five Thousand (25000) Naira was fraudulently withdrawn from my wife's Stanbic ibtc Bank Account. What baffles me was she didn't get alert for the transactions till even as i types this. She found out her money was missing when she bought airtime directly from her account.

We went to the bank to get statements of her account put realised her ATM CARD was used on the POS centre and machine below in the picture.

Please, how do we track this transaction?
Thanks

source http://www.nairaland.com/6353201/photos-how-track-fraudulent-pos