Hello I have a problem in deactivating two factor. Please help. It has been activated unintentionally

See the following from Two-factor authentication for Apple ID - Apple Support

Bold added by me

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 within two weeks of enrollment. Just open your enrollment confirmation email and click the link to return to your previous security settings. Keep in mind, this makes your account less secure and means that you can't use features that require higher security.

If you have 2-Factor Authentication (2FA) - it can’t be turned off.

If you have the older 2-Step Verification (2SV) - it CAN be turned off.

You can verify which system you’re using; and if it’s indeed 2SV - turn it “off” - by logging-in to:

https://appleid.apple.com/