Nerang Railway Kiosk Nerang Station

Please don't support these people. I ordered a small flat white for $3.50. I handed over a $20 note, and I know it was $20 because it was red and the only cash I had.
I got $6.50 change and when I asked for the other $10 they insisted that i only gave them $10.
Be careful, check how much you give them and check your change. I don't like being cheated! I really should report them to the police but I have no proof unless they have a surveillance camera in the shop.