Uber driver stole my money.

I placed an order for delivery from Debonairs Preller in Bloemfontein yesterday, it was for a cash payment. My order arrived and I handed the driver Danile R90 and also verbally said it was R90 (to be clear the food total was R75,90 and with deliver and admin fee it totaled about R87, so there was a small tip too). Before i even got back indside, i got a notification from Uber Eats that i only paid R7,00 and was R80,90 short! After trying to contact Uber Eats to sort this out, i got a horrible message saying that my account is in arrears and that they have graciously written off my debt because I'm a loyal customer. They managed to make me feel like a ******** when i know i have done nothing wrong.