Humiliated Beyond

So i went to Shopprite 120 end street in Johannesburg this morning because i was looking for g**** fruit and i couldn't find, i stood there for a while because i couldn't understand why they did not have it , then i went to the isle where they keep baking stuff i was looking for baking soda but then they did not have it, on my way back went pass the tin stuff aisle. The mistake i made was not declare the tuna in my bag as i had even forgotten that i had it, of which i bought at shopprite a month ago because that is where i buy my groceries, mind you i have been shopping at this place for over 5 years. i forgot to declare it at the door as i was in a rush to get to work. so like a person who has nothing to hide i open my bag so that they could search me i mean there is nothing to hide i did not ***** anything then boom a tin of tuna. This is when i was made to stand still to discuss why is the tuna was in my bag, my reasoning was i forgot to declare it as i came in but i brought this from home, i had to defend my self i was asked what was i buying at the shop hello i did not buy anything because i did not find what i came for. Then i was made to wait in the mean time everyone is staring at me i can only imagine if the shop was full i would have been the talk of the town the girl that stole the tuna. so i ask the Lady at the door why would i ***** a tin of tuna if i could just pay for it i mean i had more that R800-00 in my purse of which i showed her? then i was made to walk with the other security lady because i asked for the manager as this was just ridiculous. i get to the office there are about 6 guys busy there so i state my case the manager who has been so helpful i think her name is Pamela apologized for the inconvenience but then suggested that i pay for it because i cant prove that it is mines so i go back with the guard to pay for something that i had initially paid for a month ago. i have never been so Humiliated and degraded in my entire life. do items not have a code that when it is bought it is st-ricked of the system i mean i bought this a month ago? such humiliation my whole day is ruined because of a stupid tin of tuna that belonged to me.