Woolworths Dash

I placed two orders on the Woolworths Dash system which could not be delivered due to the delivery address not being serviced by the Dash application. Payment was processed in spite of this. I received credits for the non-delivery without the tip portions of the delivery. When I enquired about this, I was told tips are deducted before the orders are processed. My question now is who received this tip as no delivery took place? They refused to refund me. If this happens to many customers somebody in Woolworths is taking money **********ly.