Worst bank and customer service ever

I regret ever opening an account with FNB. I visited your branch multiple times to assist with account cancellation. I was advised a few times that only a teller can do that and one is not available at the moment, on few other occasions the bank was extremely full making it hard for me to wait longer because of my working hours. I sent an email requesting this account to be closed and was advied that I will receive a response with 3 to 5 business days but here I am still waiting.