They already have your bank statements. How do you think you get your bank statements? If you don't bank with them,they have no business knowing.If you do, and they suspect you are running a business through a private account, they already have all the information on their records. If you do,and the suspect that you are also banking with another bank, they still have no need of your bank statements. A simple question whether you are are or not will suffice.
It's a scam.