I sort out emails that I expect to get. Everything else is suspect. Anything that comes in at random, I do a who.is domain search on the Return Path address and the unsubscribe URL found in the email source code. I usually find that the domain is listed as being form a foreign country and is less that 24 hours old at the time the email was sent. Sometimes I will run the email header through an online analysis tool to find other questionable things like the SPF Authentication or the DMARC Record status. I get sometimes about a dozen a day. Those emails are usually about giving me something free or heavily discounted, a package tracking or something of that nature.
For scam emails that are spoofing an actual company, I take the time to report them to the abuse email at the real company.
I usually let call roll into voice mail but if I have time, I answer unknown numbers in Chinese. If I have a lot of time and I am in the mood, I answer and talk them in circles for as long as possible. Usually they will get to a point and hang up. However, a few times I got them to scream swear words at me as they hang up. When that happens, I know I have done my part.
We've done that, too. Some companies are very grateful and thank us and follow up with us. Others don't seem much to care.