Dont take free samples

Dis-chem in brooklen mall pretoria will never see me and my money again. I had a terrible experience afterwards spending my money there. I was buying a few beauty products and received a free sample from the beauty consultant in the shop. I have put the sample in my bag and after i paid the securities stopped me outside the shop, infront all the people in the mall and told me i did not pay for it. I was explaining that it was a free sample i received and asked if i can go and said to me i must wait while he is confirming that it is a free sample. I am so embarrassed. I wil Never ever buy at a dis-chem again And i think they should not give free samples and afterwards words accuse me for *****ing!!