UberEats does not deliver what has been ordered and paid for

I ordered 6 pizzas from Romans Elarduspark through UberEats and paid a total of R539,60 (this included the R10 delivery fee and R50 tip). I only received 4 pizzas. Uber Eats insists it's only 4 pizzas for the price I paid, while Romans agrees the total price is for 6 pizzas. After 3 absolutely useless arguments with UberEats, I am still short of 2 pizzas plus R155, 90 lost. I will never order through UberEats again. Customer service is disgusting and so is the taking of my money, without providing the food ordered or even a refund.