If your sponsor doesnt give you a no objection certificate, you can not get your visa transferred...

Provided, thers any legal court case going on in between you and a third party or your sponsor and you got court’s permission to work somewhere else.

But in any case you will not be given a release to work for your sponsor’s business rival/competitor.

“We make a living by what we get; we make a life by what we give.”

Sir Winston Churchill