Very disappointed client

For the first time I used ubereat and received such a very disappointex service I place an order and this time noko the lady was supposed to deliver it she marked the order as delivered at the time a already gave her the tip. Waiting at the gate coz now am thinking she doesn't wanna waste time and when I reported the matter to ubereat they don't me that I need to call when I called her phone was off then they said they have arranged a refund that will take 3 to 5 working days so today I decided let me do a follow up and the respond I got was unfortunately I won't get a refund as this was supposed to be reported 48hours ago. What should I do now +-R300 is a lot of money that one can just let it go just like that. Please hepl