labour union

You should file a petition against the employer in state labour court regarding your issue... according to me labour court would be effective way to solve the issue....

Salary deductions are made without authorization or employee's knowledge. Every worker has the right to just and favourable conditions of work, including to be paid fair wages for their work. Deducting money out of an employee's wages before they are paid in full and without their consent is an unauthorised deduction.

Allowable Deductions

• Life insurance premium.
• Equity Linked Savings Scheme (ELSS)
• Employee Provident Fund (EPF)
• Annuity/ Pension Schemes.
• Principal payment on home loans.
• Tuition fees for children.
• Contribution to PPF Account.
• Sukanya Samriddhi Account.
• NSC (National Saving  Certificate)
  Fixed Deposit (Tax Savings)
• Post office time deposits
  National Pension Scheme 

An employer can deduct wages if an employee damages or loses goods entrusted to them, or loses money accountable to them. The damage or loss should be directly due to their neglect or default.

it can be raised as a labour dispute