ok here's the twist.
WG Manager saw the footage and claims that I took a card. And I checked my leftover OV Cards and did found one extra card. I tried to check balance for this card and it says some error.

Then I asked the manager to print out the receipt and what might have happened is that the cashier ringed two OV Cards first and voided one. That way she got me with the unactivated card and she kept back the activated in store rack.

Store Manager says the duplicate receipt that he printed will NOT contain the card number. It just shows the Time, OV Card, amount card used etc.
He is not sure of how to get the card number?

All he is saying is that I took one card and left one card back with cashier.

I don't even know how to explain all these to discover.Please help me.