(4)Where any deposit is accepted by a company after the commencement of the Companies (Amendment) Act, 1974 (41 of 1974), in contravention of the rules made under sub-section (1), repayment of such deposit shall be made by the company within thirty days from the date of acceptance of such deposit or within such further time, not exceeding thirty days, as the Central Government may, on sufficient cause being shown by the company, allow.