“You’ve been hacked”

it's phishing to try and get you to download something.. and that something is probably some sort of malware.

ignore it

Definite fake.

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Phony "tech support" / "ranso… - Apple Community

Fake. Scam. Phishing.

Same as you won 5 millions dollars.

Or you have 12 viruses.

Or your iCloud is compromised.

.....

If a notification told you to download it then that is the last thing you should do. You should never use VPN on any phone or computer except to connect to a company internal network.

See this illuminating article—>https://gist.github.com/joepie91/5a9909939e6ce7d09e29

Good app do not need scare tactic.

You are welcome.

Stay well!

You're welcome. Be safe and stay vigilant.