I can’t turn off two step verification

Do you mean 2-factor? Yes. Unfortunately, once you begin using it you cannot turn it off unless within a 2-week period.

Two-factor authentication for Apple ID - Apple Support

"If you already use two-factor authentication, you can no longer turn it off. Certain features in the latest versions of iOS and macOS require this extra level of security, which is designed to protect your information. If you recently updated your account, you can unenroll for two weeks. "

If you do mean 2 Step Verification 

How do I turn off two-step verification?

Sign in to your Apple ID account page.

In the Security section, Click Edit.

Click Turn Off two-step verification.

Create new security questions and verify your date of birth.

You'll get an email confirming that two-step verification for your Apple ID is off.

Apple ID - Two Step Verifications FAQ