A full refund back to the card is possible but a partial refund is not possible at the moment. We may consider adding this option in the future.
If you seek a partial refund then it has to be discussed with the takeaway and a cash back or a discount or money off on the next order has to be arranged (at the discretion of the takeaway).
If you want us to assist you with this, we will be more than happy to discuss this with the takeaway on your behalf.