The City shall revoke the permit of any dealer or fuel-handler refusing or neglecting to comply with any provision of this chapter. The City shall mail by certified mail addressed to such dealer at their last known address appearing on the files, a notice of intention to cancel. The notice shall give the reason for the cancellation. The cancellation shall become effective without further notice if within 10 days from the mailing of the notice the dealer has not made good its default or delinquency.