Defamation of character

Hi. I was at Pick n pay Harrismith on the 11th Dec. I wanted to buy Russians and I asked for 4. After see the price of R60 I left then in the store. Yesterday the 14th I went again to buy something different. Then I'm stopped at the door by the security. He calls me by my name and says " the manager wants to see you" and then he uses his walky talky and says " come to the door". To my look a see a Pick n pay employee (Mokoena) and another security. ( long story short) I'm seen on camera eating 1 russian on Sunday. I asked if they are sure if it's me they asked if I was not there Sunday with 2 other gentleman. I agreed. Then I asked to see the footage. The security said "its fine let him go". I refused go and insisted on seeing the footage. They left me there and I went to the manager and the manager said they will bring the evidence. Still I stood there and the security and Mokoena they came back and said they don't see me eating the Russian. They didn't apologize. They caused a seen on me with customers and staff looking at this. They didn't even call me to an office and explain whatever nonsense. Even the manager didn't come back to apologize. This matter I'm taking it beyond this. Defamation of character!!!!!!!