Woolworths, unhappy!

On 4 January I used my Woolworths app to pay a settlement amount for my clothing account, using my credit card details. This amount is not allocated by Woolies because they need a Proof of payment. Credit card does not have POP option and I have sent them transaction history plus my statement but still they want "POP". My bank has confirmed that the money was banked. Why does Woolies have the option to pay by card if it will be such a hassle to get the funds allocated?? Now they keep calling me because I am "in areas".