Nonchalant and ****y manager

I went to Pedros Gateway and I stood there for over 20 minutes without being attended to and because no one was saying anything despite the indication that I wanted to place an order I decided to do a self service and I placed an order worth R399,the order included a mega family meal that comes with 2 chickens and the Pedros system prompted me to select more than two sides and the price remained the same so I paid for my order and about 10 minutes after placing my order I was called by the lady at the counter telling me that the system had been faulty and that I need to eliminate some of the sides,I then told her that I will not be doing that as it's not my fault that your systems have a fault and no one told me that prior to placing an order,the staff was ok but the manager on the other hand was very rude and nonchalant,even advising me to take this further,she was arguing with me the whole time and don't get me wrong,I know my rights and I know that as per the consumer protection act what was done at Pedros was against the law,I spent 1 hour 30 minutes waiting for an order I never received because the manager insisted on refunding my order as she could not honour what the receipt and your system was saying to me and I know that by law as a customer I should receive any services advertised for the price that they are advertised for and Sigu Mthembu ensured that I as one of your loyal patrons never want to have any experience with Pedros chicken ever again,she alone made me want nothing to do with Pedros,she was rude, self centred and didn't treat me as a customer deserves and she went as far as hurling words that aren't pleasant in front of her staff,I got a forced refund and even so,as if that was not enough,I was refunded in cash when I paid by card and she was just nonchalant all the damn time,I want an apology from this person that's supposed to be a manager but had people working under her acting better than her.