Non Delivery AND no refund. No response at all, in fact.

I ordered food and included a pretty decent tip only to not receive the food at all. The status of the order was updated to Delivered. I could not get hold of the courier initially and when I did his English was not great and I could not make any sense of what he was saying. My Support request on the Bolt app only received an auto-response committing to getting back to me 'shortly'. It is now midday of the next day and I still have had no response. I am a regular user of the Bolt App and was very pleased when the ability to tip was added recently. This is Very disappointing service. I will not feel comfortable to order through the app in future as there seems to be no recourse in this type of instance. With no phone number nor email to log the query. Just a Support option within the app which doesn't result in a response.