I received an email from a hacker

Unless you've jailbroken your phone it has NOT been hacked. What you received is a Phishing Scam message. Ignore it. Never click on or respond to scam messages. NEVER.

See this for more information --> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

It's a scam sent by criminals.

Ignore, delete and move on.

Ignore it, and all such bogus messages.

Do not interact with the message or the sender.

Phony "tech support" / "ransomware" popup… - Apple Community