It has already been posted in other thread:
There are many IT/ITeS employee's unions and that have affilliated with trade unions.
Search and contact them for support.
'Software Trainee' might not be aprentice as per Apprenticeship Act.
Approach avery able counsel specializing in Labor/service matters.
Your counsel may opine that you can approach/lodge complaint with:
Inspector appointed under; Delhi Shops & Estbs Act, Payment of Wages Act
O/o Labor Commissioner
Higher Officials of Dept. of Labor, Delhi
You may also lodge complaint with Inspector appointed under; Payment of Wages Act
Prefer to consult; IT/ITeS employee's unions, Trade unions, A very able Labor law Consultant