Complain on my business account

I opened my business account in July with Nedbank (Sandton city) and it has been running since then . Until last week Thursday when one of my clients needed to deposit money in . I called my financial adviser asking him to assist me with my account but he told me that my account has been closed. He said he will escalate my matter to his branch manager of which he did. On Monday morning the 09/10/2017, i went to the branch to follow up on this matter , but the manager was in a meeting. Later that day, my financial adviser told me that the manager had declined to reopen my account. Firstly, i had not been notified prior to my account being closed, and i am still clueless on why my account is closed.