Bad attitude from the staff

I was at FNB Mall of Africa today to change address, as I was waiting on que the lady called Kgomotso came, she ask me how may she assist, i told her that i want to change address, Kgomotso said to me what do you have, I said I have a letter that includes the address that I want to change to but the letter is from the other bank, she said we dont use letter we need bank statement from this bank go back and ask them to give you statement, I said to her so I have to go back and wait on the que and come back and wait for another que, Kgomotso answered me with an attitude and say mam unfortunately we dont accept any document for proof of address,Sicelo came and interfere, he ask me to follow him, he assisted me to print bank statement within FNB withount me going back to other bank in less than 5minutes were by Kgomotso should have done the same than giving attitude, behaviour that she shows when I compare her to Sicelo this tells that Kgomotso can let customer leave FNB and even if I was a first time customer to FNB, Kgomotso was not going to care because she shows that what she said is what it is and according to her there was no assistance from her further, but Sicelo is hungry to retain FNB customers he can not stand to see customer leave FNB. I ask Sicelo were to put compliments about how he resolve my issue because wow the way he took over the argument from Kgomotso and assist me as a customer was so amazing, he gave me paper to write and he ask me if I want to be assisted first or if I want to write first and i ask to write first in the mean time he ask the other consultant who was surpose to assist me to take another customer then I will go after when am done writting, when i have to go after the other customer, then Kgomotso came again and put another customer before me, consultant who was suppose to assist me tell her that but I have to assist this customer (Me) first since she was here first just that I was assisting other cistomer while waiting for her to fill the form, unfortunately Kgomotso refuse and put other customer. Then she came to me and tell me mam but you were ther e we call you, because she couldnt stop giving me an attitude I simply said to her I dont need your explanition you did what you did and I thank you. Then I had to wait, Consultant called me after he finish withe customer that Kgomotso bring to him infront of me, this consultant was down to earth and he looked very embarrased by Kgomotso's behaviour and he started apologising before anything. And I say No is not your fault. I left FNB with a heart broken due to treatment and disrespect that I have experiance from Kgomotso. I doubt if I will ever visit FNB Mall of Africa, I was also thinking of changing bank with immediate effect but I thought of Sicelo who step in and I just tell my self that maybe if I go to other FNB branches I will find consultants like Sicelo who is hungry for customers. As for Mall of Africa I will never go to that branch again because am scared to meet Kgomotso who just mess up my day.