(1) An employer shall, in order to terminate the contract of employment of an employee who has been in his continuous service for a period of thirteen weeks or more, give to that employee a minimum period of notice calculated in accordance with the provisions of subsection (2) of this section.

(2) The minimum notice to be given by an employer to terminate the contract of employment of his employee shall be -

(a) if the employee has been in the continuous service of his employer for less than two years, one week,

(b) if the employee has been in the continuous service of his employer for two years or more, but less than five years, two weeks,

(c) if the employee has been in the continuous service of his employer for five years or more, but less than ten years, four weeks,

(d) if the employee has been in the continuous service of his employer for ten years or more, but less than fifteen years, six weeks,