UberEats are useless

I placed an order from Pizzabox on the UberEats app on 4 June. I ordered a chicken and mushroom pizza with a banting base which was charged for extra, but when this was delivered is was a standard base. I contacted UberEats immediately on their website. The agent said I should do it via the app. I rated my order on the app indicating the issue, and no-one responded. Today, 9 June I used every possible way under the help option to get a reaction, and UberEats says due to it being more than 48 hours after order was received they will not refund. I rep**** on the original feedback where the agent advised me to use the app, and another agent responded that the query was resolved. It was not resolved, and I want the money back for the order that was incorrectly delivered. I think it is unacceptable that it is not actioned and that no-one cares to provide proper customer service.