Security guards need to wake up!!!

I did my shopping, when I got to the till the teller told me I do not have to take out the bag of potatoes because I have a whole trolley full of stuff... I paid, when I wanted to go to my car, the security guard at the door(which was right infront of the tills) went through all my things and made such a seen because the potatoes was not on my slip!!!! I was furious!!!! Not to mention that there was about 3 other families that just walked out without any security guard check them!!!! I honestly hate this Makro!!! I am stil very upset!!!!