When an insurance carrier has certified a motor vehicle liability policy or policies under this Act, it shall notify the Secretary of State of any cancellation by submitting an electronic notice at least 15 days prior to cancellation of such policy and the policy shall continue in full force and effect until the date of cancellation specified in such notice or until its expiration, except that such a policy subsequently procured and certified shall, on the effective date of its certification, terminate the insurance previously certified with respect to any vehicle designated in both certificates. All electronic certificates must be submitted in a manner satisfactory to the Secretary of State.