Soshanguve Crossing Identity Bad customer service

I went to Identity Soshanguve crossing branch to purchase clothes and when we got the, the was an item I liked and they did not have the exact size and opted to take one size lower. I tried to fit the jacket by the mirrors on the department and the security of the store said we don't fit on the floor, was surprised by that as there mirrors in the store were we check minor fittings that don't require a fitting room. So I proceeded to other departments an I was followed like I'm a ***** and I came to shoplift and that was uncomfortable to shop in that store. Than finally went to the till point and I asked the cashier to check for me the size that I want and she advised that the sizes are at distance stores, so I said to her give me the jacket so I can check if it will not be to bad as I really wanted to purchase the jacket and she said no, go to the fitting room to fit and I said I cannot go to the fitting room as I just want to check the size and she refused an said its their store policy that all fittings require a fitting room so I requested to see where it was written that customers cannot do minor fitting since there mirrors in store for that in all departments and she called her Manager Maria and they refused to show me where it is written that customers cannot do minor fittings that do not require fitting rooms as a customer if that rule exist it must be in writing in store and not by hear say from store associates. I told them that I was not happy with how they were treating me as a customer and requested for a refund for the items I bought and went to another identity branch that never gave me issues with doing minor fitting in store by departmental mirrors.