Rates and charges filed with the Commissioner of Transportation by a household goods carrier may be changed only after thirty days’ notice to the commissioner, except when such change is to enable a household goods carrier to meet the rate of a competing household goods carrier or household goods carrier not subject to this chapter as hereinafter provided for, and except that the commissioner may allow changes on shorter notice for good cause shown. The commissioner may, upon protest of any interested party filed within twenty days from the date of an application for a change of rate or, upon his own initiative, at once, hold a hearing concerning such rate, and, pending such hearing and the decision thereon, the commissioner may suspend the operation of such schedule and defer the use of such rate, but not for a longer period than sixty days beyond the time when it would otherwise go into effect; and, after hearing, whether completed before or after the rate goes into effect, the commissioner may allow or disallow or prescribe the rate or rates. If the proceeding has not been concluded and an order made within the period of suspension, the proposed change of rates shall go into effect at the end of such period. When the change in rates and charges as filed with the commissioner is to enable the filing carrier to meet the rate published and filed by a competing household goods carrier or a household goods carrier not subject to this chapter, such change in rate may become effective upon the effective date of the rate of the competing household goods carrier or household goods carrier not subject to this chapter, provided such rate shall be published and filed prior to the effective date of the rates or charges of the competing household goods carrier or household goods carrier not subject to this chapter; and, if such change in rates and charges has been published and filed subsequent to the effective date of the rate of the competing household goods carrier or household goods carrier not subject to this chapter, the effective date of such change in rate and the filing of the tariff or supplement providing therefor shall be consistent with such reasonable regulations as may be prescribed by the commissioner, but the effective date of such rate shall not be deferred for a longer period than thirty days beyond the time when such rate was filed with the commissioner.