Closing my account without notice!!!?

FNB closed our business account(Sports club) due to inactivity and a negative balance. I understand that they should close it on a negative balance, but they did not notify me of anything. I just received a sms stating that the account is closed. Now I need all the documents of all our signature holders and club registration letters to go open the account again. I told a FNB employee on the phone that what stops me of going to another bank. Hê said that the negative balance will reflect badly on my credit chec****! What?? How can you even, without notifying me of anything. Only sending me a message after closing the account.

Your banking fees is so high, can’t you atleast pick up your phone, call me and tell me to rectify the problem within 60 days or something like that!!

I am very unhappy!!