Saying they were "The firemens association" and desperately needed donations to aid our heros.. I almost fell for until he transferred me to a barely English speaking operator asking for me account info. How disgusting.
I answered the phone but did not say "Hello". I waited for the other party to provide a greeting. After about 10 seconds I got a fast busy. They disconnected, which is an Abandoned Call.
The Abandoned Call earns them a FCC complaint. You can file the complaint by scrolling to the bottom of https://www.fcc.gov/consumers/guides/stop-unwanted-calls-texts-and-faxes .