Legalnotice from employer-is the employmntcontract enforceable & valid

My wife has been served legal notice by her employer as she has left her job without serving notice period. The notice period was 2 months if probation passed and 1 month if on probation. He(CEO of company) is demanding 1.5 lakh plus 2 months salary and 24% interest. He has also verbally abused and threatened and mentally harassed I need help in - 1- Understanding if the clauses added in the employment contract are even valid as per labor law/contract law. In my understanding they might be arbitrary but need expert opinion as the employment contract is signed. (Clauses 7a,7b and 7c in the employment offer) 2 - Replying to the legal notice 3 - Drafting terms of settlement - even if in the worst case 1 months notice is served; it will be 9 hours a day and the salary will be paid in full after serving notice period else we will take legal measures.