Most likely the bank is doing you a favour.
They are requirred to report suspicious activity on accounts to the IRS (at least here in Denmark, not sure how it is where you are located), so seems they ask first what is going on in your account.
Send them the Terms and conditions from a few of yours sponsors and some statistic screenshots matching a few incomming transfers and they will most likely leave you alone.
You are ofcourse not requirred to do such a thing, at least not untill the IRS knocks on your door
