Ridiculous waiting period

I went to Nando's at Leaping frog on the 5th Feb. I placed my order at 18:26 and only got by food at 19:06, making it 40 min waiting period when I was told that the waiting period would be 10 min.

My biggest issue with the waiting was that I walked in and noticed that all the drive thru customers were being served within 10 min. When I asked the Manager - Sarah, she told told me that it was because I ordered a lot of food. her response was totally pathetic and insulting. Is it a Nando's thing to prioritize in drive-thru customers because they get timed?