Missing payment

You are threatening me with legal action. I sent you my bank statement with proof that the payment was made to you, unfortunately there is no other proof as the payment was made via the app you made available. Don't you pick up that there is a payment on your system that can't be allocated to any other account? My only wrongdoing, I used my account number as a reference and not my card number which I also explained to you in the email I sent your customer service department and to LaurenR