Customer raises voice at me...

My first customer raises voices at me, huhuhu it's not my fault it's his fault and he's the one who raise voices with me... Coz his payment is $25.49 and he wants to pay it separately, $13.00 for credit card and the rest is for his debit card... And now when he swipe his credit card it went through and i ask him to swipe his debit card then he swipe his credit card again and when i tell him that it's the same card that you swipe first sir... Then he raise his voice and he call the manager that i don't know what i'm doing and my fault... HUhuhu, customer customer customer...