Your Line Managers, HR personnel are not your employer and are just another employee in the company.
Did you submit notice of resignation by letter thru Redg. Post, Or by email or in some software ‘Resignation Tool’?
Submit notice of resignation mentioning notice period in it, preferably by letter addressed to appointing authority thru Redg. Post. You can mention the reason as it is a valid reason.
Affirm in subsequent communications that notice pay be adjusted in FnF statement and same be supplied to you for verification and acceptance by you along with acknowledgment of notice of resignation, acceptance of resignation, service certificate, Form16 as per correct FnF statement, Relieving letter, PF number and PF a/c slips for entire tenure of service, ESIC card, payment of FnF dues by bank DD only, NOC/NDC so as to reach you by redg. post within and up to last date in office after expiry of notice period of ………………days tendered by you i.e. dated………….. .
Notice period is not dependant on just T&C inserted in appointment letter.
You may find many threads on similar subject relevant and can pick up relevant points e.g.; however pls do not jump to any conclusions until the merits in your specific matter are assessed by your able Labor law Consultant/Service Lawyer.
https://www.lawyersclubindia.com/forum/Whether-notice-period-has-to-be-given-during-probation-91808.asp#.UwDFP0eBmXU
https://www.lawyersclubindia.com/forum/Chennai-IT-company-Notice-period-not-serving-legal-implications-106510.asp
https://www.lawyersclubindia.com/forum/details.asp?mod_id=85821&offset=1#.Uf4_JNKAqWM
https://www.lawyersclubindia.com/forum/Notice-period-nad-absconding-employee-92345.asp#.UpMpStIW1MA
https://www.lawyersclubindia.com/forum/Mnc-issuance-of-experience-certificate-re-leaving-letter-92229.asp#.UoiogdKAqWM
https://www.lawyersclubindia.com/forum/One-sided-notice-period-92171.asp#.UoiondKAqWM
https://www.lawyersclubindia.com/forum/Query-regarding-relieving-letter-and-continuity-bonus-92151.asp#.Uoio6NKAqWM
https://www.lawyersclubindia.com/forum/Whether-notice-period-has-to-be-given-during-probation-91808.asp#.UoSg3nCAqWM
https://www.lawyersclubindia.com/forum/Notice-period-92146.asp#.UoTD33CAqWM
https://www.lawyersclubindia.com/experts/Different-notice-period-for-employee-and-employer-during-probation-432151.asp#.UoTGvHCAqWM
It shall be appropriate to visit a Labor Consultant/Service lawyer along with elders in the family and show all docs on record, give inputs in person, understand the merits and pursue the most suitable option to you.
Let your lawyer draft and structure all of your communications/representations now so as to suit your long term interest and also to prove on record that your line managers, HR personnel had turned vindictive, zeleous, biased, and their intention was malafide.............