Inconsistency in policies and procedures

I bought a bra mistakenly took the wrong cup size at Polofield Pick n Pay Clothing, I then went to Princess Crossing Pick n Pay on 08/04/2025 for an exchange and they assisted me. When I got home then I realized now that I had taken the wrong band size, then I went back again to Princess Crossing Pick n Pay to exchange that. The cashier that served me told that I can't exchange a bra as it's against their policy. Now my problems were: 1. I got confused by this as just 4 days ago I was there and they exchanged for me. 2. I asked the cashier who had assisted me for her name but she didn't want to give me her name instead she then decided to and go call the store manage for me. 3. The store manager didn't want to also give me her name instead he kept calling me to his office to "resolve the issue" which I didn't have. I had just explained my encounter 4 days ago and he said he can't comment on that since he wasn't there and I didn't even know the cashier's name (he dismissed this inconsistency on their procedures/policy) and told me whoever assisted me was wrong. Now as a customer don't I have the right to know the name of the teller/cashier who assisted me? Why did they refuse to give me her name if they were doing everything by the book?