refusing to change goods

This morning my mother went to buy me cigarettes at pick n pay as I was busy taking care of my father. Unfortunatly she bought the wrong packs. I went back to pick n pay to ask them if I could exchange them , after waiting way to long the manager came up to me and said sorry he cant exchange it because it left the shop. So I just wasted R348 for nothing. This is really pathetic and I personally think the manager must get some customer skills as he is likely the most arrogant person ever. My mothers business and I buy groceries there every week but now I think we will rather take our business elsewhere