“(1) If an officer acting for the purposes of this Act is of the opinion that a worker who qualifies for the national minimum wage has not been remunerated for any pay reference period by his employer at a rate at least equal to the national minimum wage, the officer may serve a notice (an “enforcement notice”) on the employer requiring the employer to remunerate the worker for pay reference periods ending on or after the date of the notice at a rate equal to the national minimum wage. (2) An enforcement notice may also require the employer to pay to the worker within such time as may be specified in the notice the sum due to the worker under section 17 above in respect of the employer’s previous failure to remunerate the worker at a rate at least equal to the national minimum wage.”