Shoprite Glenridge the biggest ****mers of Soweto

I have a complaint against Shoprite Glenridge at Soweto. Everytime when I buy I don't receive my full change. The cashiers at Shoprite always still my 10cents change. I once I asked on cashier why is my change short, she wanted to be smart with me as if I'm crazy, it's my money afterall. This has been happening for years and I wonder how much money does Shoprite a month let alone a year from *****ing people money. It could be millions. Why are ****** like this or is this a **** that Shoprite cashiers are running. Please help!!