Employee forced to leave the company for complaining on his manag

Dear Learned lawyers please help my friend 1. My friend works in a large BPO organization 2. He was team leader doing good job in his work, but manager coming and doing micro-management 3. First time manager used filthy language and my friend walked out of company 'weeping', later manager apologized 4. My friend joins back and continues his good work 5. After 2 months again the manager meddles in the team and harasses 6. My friend in a fit of anger 'Quits' citing harassment as reason, but continues to work, manager stops interfering 7. Apart from resigning online he also writes a email to HR manager that he has quit only due to harassment 8. HR keeps quite for 2.5 months, my friend keeps working, manager is also not disturbing 9. All of a sudden a replacement is identified for my friend and is told that his resignation is accepted and he can leave company after 15 days (3 months notice period) 10, My friend is shocked , instead of inquiring into harassment, they not only replaced him from a good running process but also asked to leave 11. My friend complains to Ombudsperson of company, but no good response, (lazy) 12. He has been given one month extension and HR is not talking to my friend , he is currently serving extended notice period 13. He has all emails in black and white. 14: He approached HR experts , many opine that Co is wrong in not investigating his complaint, no inquiry was set up and decision has been taken only to protect the manager by showing door to harassed employee" 15. Can my friend approach Labour Commissioner or he should file a case on company for harassment and illegal termination ? PLEASE HELP