worst ever service received at Engen Garage

I went to Engen in khayelitsha yesterday evening 19 November 2018 to purchase snacks and drinks and the service i recieved was an unbelievable nightmare. I was assisted by the lady with a name badge Ziyanda. I took snacks and drinks and at the counter drinks scanned more than the price on the fridge... I informed her and she said no the drinks are not on special and i told her the price on the fridge is the actual price of the drinks not special. She looked at me and laughed at me and with a loud voice which alerted everyone in the shop of our conversation she said... unfortunately this is the price it scans and it is either you take it with it or leave it. I was shocked and asked why is the price there she responded by saying "I will remove it". and at the time she didn't stop laughing. I asked are you laughing at me?! She scanned the snacks and just responded by saying "so are you taking these drinks or not" I said i am taking these drinks with the price on the fridge she said come back tomorrow morning at 8am and speak to the merchandisers not me. She then continued to to ask for my number for some competition when purchasing snacks and laughed. When I told her her service is horrible she laughed and just said next customer. The old man who was behind me was shocked as well and even commented by saying i am still address this lady with so much respect yet she treat's me like no customer as if she is doing me a favour by assisting me. I am still shocked by the service she gave. She doesn't deserve to deal directly with clients. She is the worst cashier or attendant ever. Could someone train her to do her job better and never ever laugh at customers again. Regards, Dorcas