Paid account but no receipt

On 3 September I made a payment on my Lewis account in the amount of R3220-00. I paid with my debit card. The amount went off my account, but the person at Lewis, Modimall in Modimolle, told us it did not go off. We went home and on the 4 September we went to the store again, this time with proof that the payment did go off, but they said they did not receive anything and will not give us a receipt. My account number is 001053, and my name is I Lloyd. If this payment don't show on there system, what happened to the money, and whey do they refuse to give me a receipt. Can you please help.