Management not giving permanent order

My wife is working in a medical college hospital as a staff nurse since last six years. She is getting salary as per minimum wages and the salary is being deposited in a bank account. The hospital shows her as a permanent staff in every MCI (Medical Council of India), MNC (Maharashtra Nursing Council) and INC (Indian Nursing Council) inspection. but even after working for sow long period hospital management is not giving her a permanent order. (They say to get a permanent order you have to work for at least 7 years) This year is seventh year of working as a staff nurse of my wife. But instead of giving her order the Nurse Superintendent harassing her mentally by scolding in bad words, dominating and making her false complaint holding some of other staff in hand. The Nursing Superintendent always use these types of unethical and illegal tactics to harass someone when he or she is eligible to become a permanent employee. Sometimes Nursing Superintendent orders orally the staff not to come on a duty from next morning until she orders them again to join the duty even she denies the holidays and forces the staff to work on holidays. Many of the staff quit job to avoid such type of harassment. As per INC, eligibility criteria to have a post of Nursing Superintendent is MSc and 10 years experience (out of which 3 years as a deputy Nursing Superintendent and 7 years as an Assistant Nursing Superintendent) but the above said Matron is not having that qualification. I want to take action against this matron under the charge of mental harassment and applying unfair trade practices. Also I want a permanent employee order for my wife from management as they have shown her so in all the previous inspections.