I've seen that "scare" video before; what they don't tell you is that it was all prearranged, and they already had the special "key code password"
The reality of it happening is not realistic. They use that story and video as a "it could happen" not "it is happening".
Sir, you were hit with what they call Ransomware, and there are a lot of different forms of it hitting everywhere.
How did you get Support Buddy?
Let me take a wild guess, it was a link or an attachment in an email. Am I close?
If it was, that was my #1 rule in all of my offices: "don't open attachments or click on links in emails you're not sure about".
If you are unsure; stop; step away from the keyboard; contact IT support before doing anything else.
If you do infect your machine it was an automatic 3 days off without pay, all of your emails and documents and pictures will not be saved.
We'd pick up the machine; take it back to the office, wipe it clean; and do a fresh install from the ground up.
This rule came about because we got tired of end users not listening to instructions.
There were exceptions to the rule (I'm not going into those right now)
Malwarebytes is a good product as long as you have the full not the free version.
And I no longer use any Symantec/Norton products, I found far too many problems with it.
I've been running ESET Endpoint Security for the last 7 years and haven't found anything better for all that it does.