In the event of any Company being wound-up by the Court or voluntarily, the existing shareholders shall be liable to contribute to the assets of the Company to an amount sufficient to pay the debts and liabilities of the Company, and the costs, charges, and expenses of winding-up the same , with this qualification, that if the Company is limited, no contribution shall be required from any shareholders exceeding the amount, if any, unpaid on the shares hold by him.