Jill is a full-time employee and has worked at AllCouriers for over 20 years in the call centre. Jill was on sick leave for a few weeks and when she returned to work with her doctor's medical clearance, Jack (who was the person on duty for her work shift when she returned) said that her medical clearance certificate was not properly completed by her doctor. Jill thought she needed to have it replaced and took back the certificate, and there was a tug of war with Jack, and the certificate became ripped. Jill was dismissed over the tug of war, being accused of misconduct. There was no investigation or interview of Jack or Jill, and no witnesses of the incident, Jill was simply dismissed.

Advise Jill under Employment Law, as to what action may be available to her?