Clicks - deplorable behaviour manager and security staff

I walked into Clicks, La Lucia Mall, a few metres into the store and the security followed me and asked if I was selling stuff. I responded 'no', to which he repeated the question. He then proceeded to ask what's in my shopping bag, I responded "my shopping". He then looked into my shopping bag and stated that it needs to be sealed, while many other shoppers in store had multiple shopping bags unsealed. I asked since when, as I shop there often. His response was "yesterday". He insulted me in the presence of other shoppers, and made me look like a ********. The manager and pharmacy manager just made an excuse for him without. This behaviour is unacceptable and should be dealt with. I would not have been treated this way had I been a different skin colour!