Beware of macdonalds cashiers who rob customers who don't check they change when paying in cash

I went to Macdonalds at vosloorus Chris Hani and the cashier the cashier gave me short change of R30 and I was not aware u til I got home but I remember the lady behind me went back with her till slip something was probably wrong with her change. I think this cashier is robbing customers intentionally bcos how do you give 11change when my change is suppose to be 41rands. My order number was 3433 I went on the 24tg of August 2025 round about 1:30pm to 2pm