FNB Botswana once again blocking an account without notification

How can a bank just put a hold on your account when they have not even let you know for what and why?

3rd year in a row that our business account has been frozen due to KYC documents that are required but not one soul in FNB Botswana Business and or Private Clients could phone us to let us know that these documents were needed. I feel this is a very unprofessional manner in which to let a client know to update the KYC documents. Not a sms not an email not even a phone call to let us know it is required.