Hi I am security guard in Qatar I was applying in...

If the previous employer refuses to give you a NOC, you may submit an application at the General Directorate of Residence and Foreigners' Affairs to allow you transfer the sponsorship without his consent. If you want to cancel your visa before starting the sponsorship transfer procedures, the sponsor is the one who initiates the cancellation procedure, and your turn is only to sign a declaration that you have received all your entitlements in the Labor Office and this is the last measure before canceling the visa, but we advise you to file a complaint at the General Directorate so that your residence is canceled without the need for the consent of the sponsor.