Bad service

I ordered from Panarottis Maponya Mall. Had a R75 discounts and my order went down to R84.50. The amount was deducted and then the actual price with no discount also got deducted. Had to call the restaurant to cancel, the guy canceled the wrong one, called again and he canceled the other one. Called ubereats for a refund and I couldn't agree what the consultant was saying. Please advise of a way forward