Defamation of character

I was accused of *****ing the s****s I entered with because the security tailed to see them inside my trolley which had veggies from Woolworths,I didn't notice as well that he didn't Mark then,the security Lady who was rude and threatening me and pointing fingers at me,I showed them their receipt,they now changing stories that I Said I bought those s****s at Woolworths , it's really tough to be a black person and be treated bad by other Black people,I need them to give me their surveillance footage that say's I stole those s****s,,I am a loyal customer at checkers hyper in festival mall but after what happened I don't even think I'll ever set my foot there ever,