refused To give me a bank statement

I went to FNB at the Oriental Plaza branch as I needed a bank statement as per request from the Maintenance court. I can't remember the gentleman's name but on two occasions he refused to give me a bank statement. I explained to him that my account is closed and that I need a statement for maintenance court and he told me to go back to court and tell them to give me a letter stating what they need the statement for. At the time it was frustrating because I had already explained what it was for and he still refused to give me the statement. When I went back to court they told me without the statement I forfeit the money outstanding that belongs to my children. It is upsetting because I'm the only one working and I'm raising my five kids and I'm looking after my mother that is a pensioner. I need this matter resolved.