How can I unbind this function to remove moving capabilities?

game.Players.LocalPlayer.leaderstats.Stop.Changed:Connect(function()
	if game.Players.LocalPlayer.leaderstats.Stop == 0 then
		ContextActionService:UnbindAction("Left")
		ContextActionService:UnbindAction("Right")
		ContextActionService:UnbindAction("Jump")
	else
		ContextActionService:BindAction('Left', onLeft, true, 'a', Enum.KeyCode.Left, 
                Enum.KeyCode.DPadLeft)
                ContextActionService:BindAction('Right', onRight, true, 'd', Enum.KeyCode.Right, 
                Enum.KeyCode.DPadRight)
                ContextActionService:BindAction('Jump', onJump, true, 'w', Enum.KeyCode.Space, 
                Enum.KeyCode.Up, Enum.KeyCode.DPadUp, Enum.KeyCode.ButtonA)

		
	end
	
end)

Yes, the the code does run (it registers when the variable changes)

Im trying to prevent player movement, but the players still moves.

Why wont the players function unbind?

(yes, this is a snippet of larger code)