Poor and disappointing service by the store manager

On Sunday I went to Clicks Evaton Mall to buy some items ans when I got home, I did not like the size of one of the electrical items I bought so I went back yesterday to see if I can exchange or refund the item. on getting there, I explained to the cashier my intentions and he called his manager and explained why I was there and the guy by the name of "Tshepo Hlapolosa, Management" written on his name tag, asked me "why" and I explained. He left standing there, didn't tell me whether to go look for the item I wanted to exchange with or whether he'll look for it or what. He was now busy assisting another cashier. I then asked the cashier that I initially spoke to as to what needs to happen now, then he asked me to go check if there's something I wanted to exchange with. When I went back to him, the "management" was no longer there, I told him that I would like a refund. The cashier called Tshepo "management" again and only then he assisted me with a very annoyed and angry face. He called some other lady, I guess who authorizes refunds, then I got my money back. Although I got my money back, I highly disappointed by the service and attitude I got from this Tshepo guy, who is the store manager. I believe that as a manager, we need to set examples and give good service to clients regardless of how we feel about the situation in order to uphold the standards of the brand.