FNB Gateway bad service

Waited outside the bank for 15 minutes before it is meant to open. Branch opens at 09:03, and then I am told systems are offline and given the option to wait. As i wait a gentleman comes inn after me and screams at the staff and he is helped even though systems are offline, then another person comes inn after me and is also helped and no staff botters to tell me whats going on. Really dissatisfied with the customer service as I have always said FNB has the best customer service till today when I was pushed aside just because I did not scream at the staff. Should I yell at your staff infure to get serviced?