Unfair closure of account.

I have a current business account with FNB branch The Glen.under the name of 1st Ennerdale Combined Division.Our account was in arrears for an amount of R263-00 We paid an amount of R200-00 on the 9th instant but the account was closed. As an NPO ,we are awaiting funds transferred into the account. We need the account activated ,we have already invested huge amounts of money into the account.To open another account will delay the payment.