Disappointed and frustrated customer

I would like to say that I am very disappointed and hurt with the way fnb handled a recent incident, we have an account with the bank were we save money as a stokvel, but there was a member who complained and fnb as a big bank did not contact the one guy we chose to take care of the account. But they just closed the account. All our savings for December are there and as most members we are happy with the stokvel. I really don't know how they can take a word of 1 person. Because no one went to complain. We would appreciate not to just take massive decisions because it's affecting us. We need the account to be up and running because we are happy as members. Please look at this matter as it is necessary please, otherwise it's bad image for a big bank like fnb. Am really disappointed.