Cashier stole money

I was at steers Mall of Africa and I bought their burger for R29,95 for my son, gave the cashier R200 and I got distracted,took the change that the cashier gave me straight to my wallet without checking it, When I got home that's when I realized that my change was short with R100 the cashier only gave me R70. I went back to steers the following day and found the very same cashier and told her that my change is short with R100 I had only R200 in my wallet, she started shaking and called a guy named Njabulo , I don’t know if it’s a manager or what she admits to the guy that she remembers me and that she gave me R70 change and the guy started blaming me that it’s not her fault but mine, I mean I was distracted and I only had R200 in my wallet that Njabulo had a nerve to start telling me about God. If the lady needed transportation money or tip why didn’t she asked instead of taking my money? This is appalling, it’s my first time I encountered just nonsense whenever I think about it it just irks me. I am never going back to Steers ever again!!!