Mr Delivery not taking responsibility for system issues

Terrible service as their system crash between making the payment and placing the order to P&P so the money gets deducted of your bank account but the order not placed and they now claim they do not see the payment reflecting on their side even after I send proof of payment that it was deducted of my account and they refused to refund me with a lot of excuses, but I am more than welcome to re-order, but they are not refunding the money that was deducted of my account