Ana vs Anna

People keep mistaking me for someone else. They keep thinking that i'm someone called Ana (long a at the beginning). I have no idea who she is! Seriously, I don't know how to say my name in an English accent without people thinking I am called Ana. I can't say it in a Kiwi accent without sounding like i'm taking the micky. I might resort to wearing a name badge, I have once introduced myself: 'Hi, I'm Anna, A-N-N-A.' Any suggestions are welcome!