Shocked and disappointed

I am very stunned and disappointed with Caltex freshstop in Old main road Pinetown. I stop there every morning to get a hot chocolate and a 2l of something to drink for my work day ahead. They know me very well, and I must point out that the guys behind the cash counter are very friendly. However, this morning at about 06:10 am 14th January doing my normal routine, I felt like some mountain dew instead of coke, as I was making my hot chocolate one of the female staff came and took the mountain dew away from me and said we are not selling this, you can't take it it's for staff, I tried to take it back and said I would like to buy this, she then took it out my hand, and said it's for staff, she then went to the fridge to unpack the rest. I was so shocked and very upset about this. I believe that of anything is not permitted for sale then they should remove it.