Uber Eats disappointing response to a client over a mess created by the app

I'm so angry right now, I can't contain myself. Uber eats has just disappointed me. I ordered food @ a particular restaurant and in the beginning the app was working fine. Then when it was close to the time my order is supposed to arrive, I checked on my app and it showed my order as a past order. Usually I get updates on the order progress but today I didn't get anything.. Then when I called the restaurant to check about my order I was told the order was given to the Uber driver a while ago and was told to take the matter up with Uber. When I called Uber they kept on telling me that on their system the order has been refunded and I should get my money within 3 to 4 working days. Mind you this is without acknowledging what caused all of this and when I asked for written proof of when I'm supposed to receive my refund so that I can have tangible proof from them that they'll refund me, they said they cannot send me that proof. I asked them how do I go with just their word and they kept regurgitating the same thing over and over again.. They even had the ordesity to tell me I can order again even though I'm sitting with an issue of not getting my initial order from them. I'm so livid right now