(a)if a creditor, by assignment or otherwise, to whom the company is indebted in a sum exceeding one lakh rupees then due, has served on the company, by leaving at its principal place of business, or by delivering to the secretary, or some director, manager or principal officer of the company, or by otherwise serving in such manner as the Tribunal may approve or direct, a demand under his hand requiring the company to pay the sum so due, and the company has, for three weeks after the service of the demand, neglected to pay the sum or to secure or compound for it to the satisfaction of the creditor;