Blue label Cosmo city

I went to buy from there having my own empty bottles. And the security treated me like am trying to ***** their empty bottles and when I asked her what to do with my empty bottles she told me to leave them with her and go buy what I wanted, when I got to the cashier she asked for a tag that shows that I brought empty bottles, I explained to her that at the the door the security lady told me to leave my empty bottles at the door and go buy........ Now I don't find it fair for me to get to a cashier to be told to go back to the the for a tag, the door which I all ready asked help for and was told to go to the cashier.....

Please assist this is a place I buy my alcohol at all the time.