SMS

In most cases, a large financial institution is going to have an email address where you can send them a copy of a phishing or scam email or website.

I won't get in details about scams in general, I have my Scam Website about that with many emails I've received over the years.

What I like is to have a list of those email addresses because in some cases, it's rather difficult to find them. That way I will have a place for them. You may want to verify before using those email addresses since they may change over time.