[MicroBob]

I would say that you aren't really interested in sending them a screenshot of your bank-account page because you are uncertain whether it's safe to do so.

You can also mention that you are sure your bank would advise you against doing this. Or you can just say that your bank has already told you not to do this.

I think it's perfectly understandable to feel uncomfortable about such a request.

Here's a really stupid question but I'll ask it anyway:
Are you sure your talking to actual Stars support and not some weird phishing attempt?