Move on. Merrill Lynch is a private company and has no obligation to do business with you. Cleary it has chosen not to. There are many other financial advisors / broker dealers in the world and you should move your portfolio there.

You could also spend a lot of time, effort and money -- emphasis on money -- only to learn that there is a problem but that nobody will tell you. One SAR filed by one entity over one transaction and you would never know and both Merrill Lynch and the filer would be forbidden from disclosing to you.

A good chance that if there is a problem, you will encounter a problem with another financial advisor. If that happens, you will know that there is a problem.