The below mentioned are PROVISIONS FOR OVERTIME
1) Provisions under the Minimum Wages Act, 1948:
Section 14: Minimum rate of pay is determined 'by the hour, by the day, or by any such period', and' is regarded to have worked overtime if they put in more time than that.
If employees work longer than the set hours, they are entitled to overtime pay for those extra hours or portions of those hours.
The Overtime pay rate may be fixed by the appropriate government.
Any employee who works on a rest day will also be entitled to wages on overtime rate
In case of Violation - Maximum punishment for infraction: six months in prison or a fine of Rs. 500
2) Provisions under the Factories Act, 1948:
Section 59: Overtime pay at a rate that is double that worker's regular rate of pay.
Violation: Sentence up to 'two years in prison, a fine up to one lakh rupees, or a combination of the two'. Further, in case of continuation, up to one thousand rupees for each day is perpetuated.
Section 51: A maximum of 9 hours a day is the daily limit whereas a maximum 48 hours a week is the weekly limit.
Section 55: A worker is not supposed to work for more than 5 hrs without a break.
Section 56: Working hours, including breaks, cannot exceed 10.5 hours.
Overtime limit: The maximum daily workday, including overtime, is 10 hours, or 60 hours per week. 50 hours of overtime cannot be worked in a quarter (3-month period).
3) Provisions under the Mines Act, 1952:
Working Hours: Nine hours above the ground and Eight hours below the ground, daily
Section 33: a maximum of five hours of continuous work
In the event that an employee is paid on a piece rate, the payment will be equivalent.
Section 35: The maximum number of hours worked per day, including overtime, is 10.
You could make an application under Minimum wages Act under the said provision and seek for payment of overtime charges along with Interest at 18% p.a. The employer could be sentenced to imprisonment. You could opt for a class-action suit, that is a situation where, the employees seeking similar reliefs are clubbed in a single case.