Bad service

I'm not happy with the respond I received from one of the coordinators at Nando's Sandton City. her name was Mbali. I went to this nando's on the 16/01/23019 to buy 2 quarter meals with soft drinks. I took time off from work and rushed there since it is a walking distance from my work place. I had my wallet and phone with me. when my order came i saw that i couldn't carry everything alone because i didn't have my bag with me to put wallet and phone so i requested a bigger bag. Mbali then said NO with a very bad tone and said the bigger bags are for bigger order which i didn't understand why as i explained why i need one, i couldn't hold everything alone. I didn't ant to say much i decided to try and carry my things and leave the place as i was so tired on the way. when i was about to leave the store I hear her telling the other guy that and besides this bags are expensive so i found that insulting and very insulting. My question to you now is that is the bags that expensive that Nandos can not be able to give it to one client that had a need and a reason for asking the bag ? and is that the way you guys running your business based on how expensive your bags are for a meal worth +R100 so this means I can only have a bigger bag If I'm only buying full chicken or if I'm buying more than 5 meals unfortunately i was only buying two meals as that is all i needed for the day.

I'm hoping to get a reply to this as I really felt offended by Mbali.