Deliveroo complaint: No Delivery, No refund

Ordered food via deliveroo. I waited by the door for the delivery closer to the time to make sure that I did not miss it… delivery time kept changing… then 10 minutes later website updated that it was delivered but I still had not received it. Nothing by the door either , checked with neighbours just incase and nothing there too. I contacted Deliveroo and explained the problem – they insisted that the driver tried to contact me (no calls received or missed calls on my mobile which I had the whole time) and delivered it at the conceierge (which does not exist). They simply took the drivers word for mine and yet this is the first time that I’m complaining about an order. I went further and contacted deliveroo help via Twitter and they said that because the driver contacted me (which they did not) they would not be processing a refund despite non-receipt of the food which is £50