Bad customer service

I am very upset about the service that i received at one of the Nando's branches in Savoy on the 4th of August 2018. I went through the drive-thru and passed 2 windows and no one was there in both windows and I waited 2-3 mins at each window and no one came out. When I finally got to the third window, there was a lady who was very rude, when we asked her to place an order and she told me to go to the first window and order there. There was an argument going back and forth between us as we did mention to her that there is no one at the two windows. She then advised that we can either drive back or come in the store to order. She had attitude and also explained to her that this is my petrol she talking about when I'm told to drive back to the place an order on where else there is no one on the other windows to place an order or pay for the order.She was not willing to help us with the order. I deal with customer service on a daily basis and if your colleagues are not pulling up the weight the next person has to. Being a CEO of your job does not hurt and leave any sour g****s to your customers mouth. We ended up going in to order as the drive thru stuff was not willing to help. Inside the serviced was slow and I could notice that still no one was at the drive thru section. The lady at the third window was about to come to the counter I think they were changing sides and saw me. She told one of her colleagues that she wont be able to help me due tom our little in-counter few minutes ago . I didn't get her name as she want wearing her tag. I'm really disappointed with this service, my order number was 284