Teach your cashiers to respect customers

Today I went to visit one of the Boxer Stores in Chris Hani Mall. I do not want to mention the cashier's name. Was on a queue to pay for two Aquelle (Granadilla Flavored) which were priced as R20 for two on the shelf. My brother who was behind me offered to pay for the drinks and I politely asked the cashier to give back my R20 and combine the two drinks together with my brothers items. I asked the cashier again not to take my R20 and she didn't take me seriously and proceeded to put the note into the drawer. I viewed that as being disrespectful towards me as I pleaded with her countless times to return the R20 but she arrogantly inserted it into the drawer. I don't want to reveal her name but wud appreciate it if this message could reach the store with the view that I would not experience this kind of arrogant and disrespectful behavior from any of the cashiers.