It does create a really bad image. Someone once traced the scammers all the way back to the Indian bank they were using. Do you think the banks care?

Bank probably knows you're unlikely to have much proof. I guess it's similar to the way people get away with putting flyers on car windscreens or paste up posters on buildings. You know with almost absolute certainty that the company being advertised is ultimately responsible, but unless you can connect all the dots, your complaint might not get anywhere.