Pick n pay security guard

this morning i was going some shopping and pick n pay was my last stop, i went into the store to get an basket and then the scanner went off at the time i went in the security guard was checking another womans stuff, but when the scanner went off he also immediately grabbed my mothers keys out of her hand without asking, and said no its not this. The i told him it probably my backpack and the i toke of my backpack so i could unzip it so i could show him what was in my backpack, he then processed to grab my backpack out of my hands an go thru my property everything that was in my backpack was paid for and i had slips for everything i had of me, which i then processed to show him and he without my permission just went thru my bag, and when he could not find what was causing the scanner to go off he said i need to leave my backpack by the front where anyone can just walk off with it if the felt like it. He grab stuff out of my bacpack and checked it, not bother by slip i was showing him. When he thpught he was done violating my privacy of bag he said oh go in, by that i was already treated like an ***** and did not feel very safe at the time so i turned arpund at lefr without completing my shopping, because i was unprepared to go thru an tramatic experience like the again where your privacy can be violated like that. I would be very careful if you are an woman gping into strand square pick n pay, i will be taking this matter futher.