Hi sir my iPhone Face ID has been disibled by mistake please active my Face ID thanks your team

An alert that Face ID is disabled is not a mistake. It most likely is an issue with your iPhones hardware. Please make sure that iOS is up to date to the latest version. If that is not solving the problem it indeed is a hardware issue and you will need to Contact - Official Apple Support to set your iPhone up for service

No one here can activate your Face ID. Contact Apple as directed above.