Section 91B. Any person offering for sale merchandise, commodities or service by making, publishing, disseminating, circulating or placing before the public within the commonwealth in any manner an advertisement of merchandise, commodities, or service, with the intent, design or purpose not to sell the merchandise, commodities, or service so advertised at the price stated therein or otherwise communicated, or with the intent not to sell the merchandise, commodities, or service so advertised, may be enjoined from such advertising by a bill in equity in the superior court brought by the attorney general or any aggrieved party; provided, however, that the provisions of this section shall not apply to any medium for the printing, publishing, or disseminating of advertising, or any owner, agent or employee thereof, nor to any advertising agency or owner, agent or employee thereof, nor to any radio or television station, or owner, agent, or employee thereof, for printing, publishing, or disseminating or causing to be printed, published, or disseminated such advertisement in good faith and without knowledge of the deceptive character thereof.