Avoid Getting Scammed

Any Legitimate Company will NEVER ask for access to your personal computer, or ask for you to install a remote client like AnyDesk, LogMeIn, etc. to your computer.
Any Legitimate Company will NEVER ask for your username and password.
Any Legitimate Company will NEVER ask for payment in pre-paid debit cards, gift cards, Venmo, PayPal, etc
Learn a greater sense of skepticism when presented with requests from parties who cannot be definitively and immediately identified as legitimate.
I understand you really really want to trust people who speak with or present as representing authority. DON’T.

Here's a newsletter from 2015 by Kadansky Consulting explaining this scam: https://kadansky.com/files/newsletters/2015/2015_08_31.html

You didn't get hacked: YET -> Never call the number!! Then, you're safe. Never let anyone else install any software on your machine and never install software by request.

Having said that:

I have relationships with my clients, and I use Jump Desktop to remotely fix their computers, but I only install the helper software when I'm physically there and with their express permission only after I explain what it does and how they have to manually click "Accept" every time they want me to start a session. Very focused needs. They can uninstall the helper software anytime they want.

Who got hacked? the ad network hosting the ad you clicked on, the website you visited, etc.

The scammer designed that bad web page to refresh 120 times/second using Javascript, so you can't use the operating system (the red 'X') to close the browser.

How to get out of the bad web page?

Press CTRL+ALT+DELETE all at once
on the screen that appears - pick Task Manager
Right-click, then select "End Task" on all processes of the browser you're using
Done
Restart browser, but never restore pages, ever.
Clear Browsing History for the Last Hour.

A "browser" is the program used to display webpages: Google Chrome, Mozilla Firefox, Microsoft Edge are the three most likely you'll see in Task Manager.

About Spam

If you think it’s spam, it probably is; always trust your gut feelings.
If you’re using an email client: if you say “report as spam”, it may not get through to your mail account’s servers.
Once a week, go to your mail account online = webmail, which is connected to the special servers that handle the mail stream and are deleting spam email directly or marking it as junk and then report that mail as spam.
If you’re already finding the mail in your spam folder, then those special servers have already handled it at some level.
Sometimes the special mail servers get confused when they see a new type of spam email from the bad guys and it takes the programmers a little while to identify them again as spam. It’s an arms race.