Section 50. Any person or juridical entity which violates any of the provisions of this Act shall, upon conviction, be punished by a fine of not less than Five thousand pesos (P5,000) nor more than Twenty thousand pesos (P20,000), or by imprisonment for not more than one (1) year, or both such fine and imprisonment, at the discretion of the court: Provided, That for any second and additional offenses, both fine and imprisonment shall always be imposed: Provided, further, That in case the violation is committed by a juridical person, its President or Chief Executive Officer thereof shall be liable.