Roman pizza Heidelberg incompetence

Romans Pizza Heidelberg. Owner is an Elsa or something. Staff was terrible and untrained. I passed through Heidelberg coming from jhb to nigel. I asked the cashier can I pay using my VODACOM app and wallet as I got discounted coupons. She said yes. I ordered and while I stood at the cashier I bought the VODACOM coupons. This is where it got terrible. I showed her the coupons she couldn't use them. Had no idea how. Manager was called one of the rudest persons I have ever encountered. She also had no idea how to use the 200 coupon I just bought in front of her colleague. Phoned her boss. Then managed to use half of the coupon. I asked her the name of her boss. She yelled it's on the wall and rolled her eyes. This person was one of the worst I have ever encountered. Lying 1st saying the coupon can't be used. Then the yelling when I asked politely the owners name. I ended up wasting 20mins to place my order embarresed by the way I was treated. I bought a voucher in front of them that apparently can't be used. Then I paid for the 3 large pizzas as I was drained by these I'm competent fools. I will never again stop in Heidelberg. I will rather use the 200 coupon in jhb where people are able to do there jobs