If an employer is not satisfied with the order referred to in section 125 and relates to Chapter IV, he may prefer an appeal to the appellate authority not below the rank of the Joint Director of the Corporation as may be provided by regulations, within sixty days from the date of such order after depositing twenty-five per cent. of the contribution so ordered or the contribution as per his own calculation, whichever is higher, with the Corporation:
    Provided that the appellate authority shall decide the appeal within a period of six months from the date of preferring the appeal:
    Provided further that if the employer finally succeeds in the appeal, the Corporation shall refund such deposit to the employer together with such interest as may be specified in the regulations.