Unprofessional conduct by your staff

Was at Johannesburg Gandhi Square branch and was attended by a guy called Sibusiso. The guy is very rude for the area he is working at. FNB caters for foreign nationals too let him be reminded that. I had gone to get bank confirmation letters for a claim at the Department of education. The Department doesn't want online confirmation letters but one stamped inside the bank. The arrogance I got from this guy I don't know is it because I'm a foreign national or what. There is always a polite way to respond to people of my age who might have been overtaken by technology.