Bad service at boxer noord streeet

I went to shop at boxer noord street on 26/09 at 17:00 I think, was assisted by cashier Nosipho sethi, I bought 3 c***** powder milk on promotion and some items, I then packed my items and took out the milk from the boxes as they easily tear the plastick she then said to me "cc hamba nama box akho, and throw them away outside " I then explained my reason for taking the milk out she verbalized she is not interested and I found the milk in the boxes and now that I bought the milk it meant that I was responsible for the disposal of the boxes. I left her shouting that I will take them with me whether I like it or not. I went to check my groceries with the security, while there another lady security which did not have a name tag came with the boxes and said I must throw them outside they are mine, I explained to her again my reason for taking the milk out of the boxes, she said the milk is mine now so I must dispose, there was a bin next to the door, I then asked her to put them there she said no the bin was for slips. The lady who was checking my items stopped and said she wont continue until I throw the boxes and said I'm not special and they wont change the manager's rules for me and other customers are disposing their boxes and I must do the same. I left them shouting until I got into a taxi. I really had a horrible experience at boxer from staff members who can't treat customers with respect. So unprofessional they don't have name tags from the cashier to the security's I identified the cashier by a till slip, I was carrying 4 plastics, and expected to carry 3 empty boxes from the strore and go out and look for a bin. I have shopped at boxer before and never got such service it's worse to say it's the manager's rule that I need to take my boxes along.