The Bitch really annoyed me!

Inasikitisha sana kukuta mtu unapoenda dukani au sehemu yoyote unapojikuta unahudumiwa na mwanamama mweusi(mmarekani) mara nyingi unatamani ungehudumiwa na mtu mwingine yeyote but her!
This month i had a terrible experience w one! I was @ a store buying stuff for a friend in Bongo who ordered things frm this store. She picked the stuff online so i went to check the stuff out.
First this b%*ch was at the reception desk, i gave her the code # for what i wanted and the bitch (ok, excuse my language am smoking mad!) said they don have any of it!
Anyway i left the place and when i got home i got online myself and JESUS! evthing was there! The next day was monday i went back to the store and found a gentleman, a brother, and he checkd and found evthing that i wanted! I told him my experience the day before and he was surprised too.
So then i went back a few wknds later , and guess what, she was there again and there was nobody else so i had no other options. I asked her to give me an invoice for the things i wanted, and she told me "We don do that", with an attitude! whats wrong with her?
I went back the next day and she was sitting @ the reception and she shouted @ me what can i help you with, i said nothing and i went ahead and found someone inside, ( a brother) along with a Manager( mdada wa kizungu), they were standing together serving customers when i asked brother if i could get an invoice and the Manager overheard that and she said "Sure", and asked brother if he knows how to do that, and together they helped me, gave me the invoice for what i needed, and i thanked them a thousand times and left.
So my issue is why is it some people are so unprofessional and down right mean? Why did she treat me in that way TWICE?
I tell you, i never told anybody this before but i know deep in yr heart you know when you go to a place like that, if u could chose to be saved by(a) mwanamama mmarekani mweusi, (b)mkaka-any, mzungu au mweusi, (c) mwanamama mzungu, najua jibu langu ni b na c, as sad as it should be, na najua si wadada weusi wote wako hivo, but kuna wachache, i'd say more than wachache wenye kuwaharibia the rest of them jina, and am really sad about that.