Blocked account without being informed

I am highly disappointed with the level of service at FNDlb and it seems to be getting worse by day. Today I discovered my account was blocked when I wanted to transact. I then visited the branch of which I was told they needed my business proof of address which I submitted. They claim to have sent me an email which I did not receive. For something so important couldn't they call or something. How do you block someone's account without informing them! Now my business is at stand still because I cannot perform any transaction....this is a huge inconvenience. FNB does not value it's clients at all, I am definitely going to move my account to a bank that cares. FNB is getting worse by day