It shall be unlawful for any person, firm or corporation engaged in or continuing within this state in any business for which a license or privilege tax is required by this chapter to fail or refuse to add to the price of the service rendered the amount due by the taxpayer on account of the tax levied by this chapter. Nor shall any person refund or offer to refund all or any part of the amount collected as tax under this chapter or to absorb such tax or to advertise directly or indirectly the absorption or refund of such tax or any portion of the same. Any person, firm or corporation violating any of the provisions of this section shall be guilty of a misdemeanor and upon conviction shall be fined in a sum not less than $50 nor more than $100, or may be imprisoned in the county jail for not more than six months, or by both such fine and imprisonment, and each act or violation of the provisions of this chapter shall constitute a separate offense.