Complaints from a very angry customer

I bought pizza and cold Drink at the mall today, when I sent someone to collect it they did not give him the cold drink! I call and the lady Sne dludla the cashier, tells me it is my duty to remind her of the extras while we produced a receipt that had the particulars. When I arrive at the shop she tells me not to speak like she’s beneath me which is absorbed because I asked how I it my duty to remind you to do your job?! She wasn’t even apologetic about it the manager who also was not helpful apologize for her and him too does not know how to be a manager or treat customers! This need to be looked into I’m from joburg and this attitude/behavior is *******!