Disgusting staff!

I am so disgusted at this McDonald's in Goodwood as the service is beyond putrid and disrespectful. I was making use of your app which was advertising "the month of love" with various specials and decided to go use this offer. When I got there I was in the drive through and was greeted by a rude lady named Asanda. She sent me to the next window and my phone fell whilst driving and I noticed as a result it clicked the redeem button. I stood in that queue behind this other customer for almost the full 5 minutes. When I got to the paying window the lady yelled at me for pressing the redeem button. I informed her that it was by accident and she did not care. She shouted at me saying I mustn't press it because now it makes her job difficult. I said to her I will explain to whomever to avoid it becoming difficult for her but she gave me such a horrible look and shouted at her manager in attempts to resolve this issue. I thought this is so unprofessional to speak like this firstly to the customer, then in front of a customer and then still to the manager. What kind of staff disrespect customers like that? As well as their manager who I could here mutter under her breath that it's unnecessary to speak so in front of customers. Not even she apologized for the rude manner in which this lady spoke to me. Then I went to the next window and was not given my full order. The app said 2 medium cheeseburger meals for R39.90. They only gave me 2 cheeseburgers and 1 drink and 1 chips. When I indicated that this was incorrect the manager then had a go at me about redeeming the offer before the time despite me trying to explain. Then she asked me to pull to the front and wait while they handle the issue further. At this point I was almost 10 minutes in a hot car and I couldn't wait any longer especially after being treated like that. I am horrified at this disgusting service and will not ever buy McDonald's again! I am a regular customer as it is so close to my work and is convenient for me to get lunch there but there are so many other competitors close by who will better treat me as a paying customer. Before this experience I would always inform people about the app and the amazing offers but what kind of offers is worth being treated like this??? I was so embarrassed to be yelled at in that manner and regret having gone. I didn't even enjoy the meal having undergone such horrible service. Needless to say I will summarise by saying that you guys need to really check who you hire to represent the image of the company as people like that tarnish the name. I hope you lose out on many more customers as a result of the rude staff that you have running the tills and managing the staff!