You cant change your sponsorship until you have completed a full year with your current sponsor.

If your current sponsor wants to send you home he can, its that simple. Without a NOC you cant return for 2 years. If you are working for someone other than your sponsor all that is required is a letter from your sponsor giving you permission to work for someone else but it can only be a temporary arrangement. If there is no permission from your current sponsor to work for anyone other than him it is illegal.

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"Diplomacy is the art of saying 'Nice doggie' until you can find a rock - Will Rogers"