Unfair treatment

Good day I went to superspar mokopane today and I bought my groceries and I forgot to pay for mealie meal, I told security That I want to pay for mealie meal since I forgot to pay for it and the security said that I stole the mealie meal, how can I ***** the mealie meal because I'm the one who notified her. They called another guy named John and he said I have to pay R500 or else they are going to call the police for me. I paid even if I didn't *****.