Rude ****s

So today I went to buy a TV stand at Fair Price. I then asked the lady that was assisting to please sell me the ready assembled TV stand as I will not be able to assembled on my own. She told me I would have to then pay cash for labor. Labor was not included in my receipt but I was accompanied to the atm next door to withdraw this labor amount. I then went came back a few minutes later to the shop to collect the TV stand and get my change for the labor money. A few minutes passed while I was waiting for my change and the guy(Manqoba) was busy assisting his colleagues and chit chatting. I told him he needs to hurry up as I am at work. He rudely told me he I shouldn't tell him about my work, he is already at his work