difference between shareholders and social part owners of a corporation

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I paid a lawyer to form a shareholding company here in Mexico, what I now find I have is a social part company and the lawyer that formed the company and aided me to sell shares, is now acting on behalf of my shareholders in a bid to get me to give them more or face legal action. He did all the dirty work now he is trying to make me responsible for his prior bad acts. What is the difference in an SA de CV company (shareholding and an S de RL de CV company (social parts company with variable limited liability.