No service and Manager **** and has no clue about her own products

So I visited the McDonald's store in Old Paarl road Brackenfell CT and ordered a Boerie and Egg breakfast meal and substitute the coffee for a cappuccino which I do every morning either at their store, Kuilsriver, Haasendal or Bellville branch as that is my routine each morning. On this particular morning when I wanted to substitute my coffee for the cappuccino which I take the small which is an additional charge of R3 to the meal, I was advised by the staff member that the machine is not working and I must take the premium cappuccino which is twenty odd rand more. I advised that this can't be right as I purchase this every morning as I have come to understand over time that if you don't specify which cappuccino you want which they don't tell you, they just add the most expensive one to your bill which I find very under handed and misleading. Nonetheless, the lady gets her Manager and she then advises me that the machine is not broken which then contradicts what the 1st lady said and she goes on to say that she has been the Manager at the store for a year already and they never sold a R3 cappuccino if you swop the coffee for a cappuccino. I advised her that we are recording this conversation as we already wasted our time standing in the drive-thufor about 15 mins as the service was slow until we eventually got to order only to be told that no such swop for a small cappuccino of R3 ever existed. I then advise the Manager that she should rather become more accustomed with the products offering of their store as she clearly had no idea what she was speaking about. The funny thing though is that she says she has been the Manager for a year already and they never ever had a cappuccino for R3 if you swop the coffee for it. Jeepers, get your act together and people please be careful when swopping out your coffee for a cappuccino as McDonald's staff tend to offer you the premium expensive one on your bill if you don't mention the one you want and then when you ask about it, it is as if they doing nothing wrong. In my case, the Manager and staff on duty that morning had no clue about their own products. Anyway, thanks for mistreating us and making us feel like we were in the wrong. I have shared my story on my Social Media platforms as well as I work in Media and Broadcasting as this is not the sort of service one would have expected from such a reputable brand. This is a disgrace and you have surely lost me as a customer.