If you tie off to a stationary object such as a tree, then use your winch or come along at a right angle to the original cable. Newton's third law in action. By pulling at a right angle, there is no opposite force at first and then a slowly increasing force which should allow you to get out. If not enough, reattach between vehicle and object and go again. Having someone pull on or sit on the cable at the center can sometimes be enough.
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