What's happening with Uber Eats

I literally just placed an order with Uber Eats buying Mcdonalds, the meal was worth R100.50 including delivery. Food delivered on time fine but I gave the driver an amount of R105.00 the rest being a tip and guess what the driver decided to do! Driver says I paid R40.50 and I short paid by R50 and now it says I owe R50 as if I didnt pay. Whats the point of ubereats though it has the worst service from the drivers and even when you try and contact the contact center it is useless!!!!