Very Bad Service

I orderd a pizza and 1.5L Cool drink but I received the pizza only. The cold drink cost R36.90 but I was refunded R11.07. I queried it on the same date but I was assured that R25.83 will follow. Uber Eats only refunded me R11.07. I denand my R25.87 because I didnt receive the 1.5L Coke on the 24th of March 2023.