Disgusting service

Went to the Nandos Kyalami drive thru on 17 March and ordered a salad, I got one sachet of salad dressing and asked for another 1 and the lady at the window who initially ignored us, started giving us attitude and told us she is not allowed to. I asked "since when?", because all the nando's I go to have never had an issue with giving me TWO sachet not 10 or 100. It was the attitude for me that irritated me as though I wasn't a paying customer and if she is not allowed to give me 2 then this should be a policy across ALL Nandos' and not just one. I hate how black people tend to give fellow black customers bad service because they think we are friends and can have their way with us and have the audacity to argue and give customers attitude as though I asked her to give me her salary nxa. She eventually gave us 1 more after arguing, what's the difference then? Why must we fight for simple things such a sachet really? When you are eating in you can have the dressing and their sauces 'til you get high on them but I get drama for one simple sachet, I am paying with my money whether eating in or drive thru, I should get respectable service across all franchises.