Section 295K. Whoever, himself or by his agent or servant, violates any provision of sections two hundred and ninety-five A to two hundred and ninety-five J, inclusive, except section two hundred and ninety-five G, shall be punished by a fine of not less than fifty nor more than five hundred dollars or shall be subject to a civil citation as provided in section 29A of chapter 98. Whoever, himself or by his agent or servant, violates any provision of section two hundred and ninety-five G shall be punished by a fine of not more than five hundred dollars or by imprisonment for not more than one year. Upon the second conviction of any licensee of any such violation, whether by himself or by his agent or servant, the division may suspend the right of such licensee to engage in the business of selling motor fuel at retail for a period not exceeding three months, and upon the third or subsequent conviction of any licensee of any such violation, whether by himself or by his agent or servant, the division may suspend such right for a period not exceeding one year.