Security guard

I would like to complain about the security guard at Spar Elar dus Park Pretoria. This guy I would say abused my rights twice. The other day I was walking out and he called me to search my shopping bag. I was a little bit disturbed because no one was searched before me. I stood outside to make sure to see if he will search other people and he did not. I came back and confronted him asking for reason why he didn't search other people he cudnt give me the answer.Today the 8th of Jan 16:00 pm . On my way out he stopped me again and asked for my number. When he saw that I was surprised he asked to searched my bag this time not my grocery bag.That is when I went to the managers office and the manager came to ask why he was randomly selecting people. He **** and said he got a tip off from patroling guys.I asked him where are those guys he coudnt provide them. He then said he wanted to search me because of my hand bag, He went on and said I should have left my handbag with him. I mean I have my wallet and car keys in my hand bag as well as my personal belonging which I don't even feel comfortable showing to a male.i opened my bag and he coudnt find anything.