How to get rid of the spyware on my iPhone?

To keep your Apple ID account secure, see the following Apple articles:

Manage and use your Apple ID

Manage and use your Apple ID – Apple Support (UK)

See who has access to your device or accounts

See who has access to your device or accounts – Apple Support (UK)

Recognize and avoid phishing messages, phony support calls, and other scams

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

Phony "tech support" / "ransomware" popups and web pages

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

Identify and filter junk mail in iCloud

Identify and filter junk mail in iCloud - Apple Support

If you think your Apple ID has been compromised

If you think your Apple ID has been compromised - Apple Support

• If you completed the steps above and think your account might still be compromised, contact Apple Support.

Identify legitimate emails from the App Store or iTunes Store ->

Identify legitimate emails from the App Store or iTunes Store – Apple Support (UK)

Set up iCloud Keychain

Set up iCloud Keychain - Apple Support

Create a strong password for your Apple ID, It is best if your password consists of eight or more characters and include upper and lowercase letters, and at least one number. You can also add extra characters and punctuation marks to make your password even stronger. 

Never provide your password, passcode, security questions, verification codes, recovery key or any other account security details to anyone else. Apple will never ask you for this information.

See also the following Apple articles:

About the 'Trust This Computer' alert on your iPhone, iPad, or iPod touch

About the 'Trust This Computer' alert on your iPhone, iPad, or iPod touch - Apple Support

Authorize or deauthorize your computer for iTunes Store purchases

Authorize or deauthorize your computer for iTunes Store purchases - Apple Support 

Get a verification code and sign in with two-factor authentication

Get a verification code and sign in with two-factor authentication - Apple Support

Check your Apple ID device list to see where you're signed in

Check your Apple ID device list to see where you're signed in - Apple Support

• if you see devices that don't belong to you, delete from your account.

Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch

Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch - Apple Support

Block unwanted callers in FaceTime on iPhone

Block unwanted callers in FaceTime on iPhone – Apple Support (UK)

Avoid unwanted calls on iPhone

Avoid unwanted calls on iPhone – Apple Support (UK)

Checklist: If you want to make sure no one else can see your location

Checklist: If you want to make sure no one else can see your location - Apple Support

Hello ~ Was this an email? It most likely a scam. Take a look here:

Recognize and avoid phishing messages, phony support calls ...

Have you given out your Apple ID to someone…even someone that you know?

If you think your Apple ID has been compromised

You need to contact your local law enforcement as well.

~Katana-San~

That is a common scam attempt. They are trying to scare you into believing they have access to your info and that they will release it unless you pay a ransom. Ignore the request.

You can change all your passwords if it will make you feel better or if you shared them.