Woolworths don't help customers

I paid my Woolworths account on 31/01/2021 at the Richmond Corner Branch. At first the cashier did not know how to do the transaction and call another cashier to show him. I paid my account and left . On receiving my account via email from Woolworths it indicated that I did not pay my account. I then checked my file with all my slips and saw the cashier cave me two slips as proof of payment without the amount that I paid. I am struggling with Woolworths for a week now and every time some else comes back to me insisting I need to provide a slip with the amounts and every time I have to explain I did not receive one. Today a lady came back again and informed me they cannot find a slip at the Richmond corner branch and I need to provide a slip. How should I provide a slip if they cannot find it . Seems now the customer needs to be responsible for Woolworths staff actions as well ???