When I asked to purchase a diesel filter on the shop floor at Mamelodi Spares, the store manager (Indian Man) treated me rudely

When I asked to purchase a diesel filter on the shop floor at Mamelodi Spares, the store manager (Indian Man) treated me rudely. He said to me, he doesn't understand sales issues when his tone of voice demonstrates disrespect for his customers. Customer satisfaction affects sales, and I want him to understand this. Due to the undermining of the backbone of any organization, which is the customer, I will shop at the competitor's store and return the items to his store. Likewise, I suspect this is an everyday treatment he gives to his subordinates, as they were reluctant to give me his name because it is a habit, and they apologize on his behalf. I think his name is sesh or cesh, manager of Mamelodi Midas.