It appears you informed leave only verbally and did not submit leave aplication and do not have leave approval.
During 50 days it appears company did not serve any show cause notice on you.
You have submitted your resignation and probabaly have not received acceptance.
Subsiquent to your resignation you may ask for acceptance,work experience certificate,relieving letter,form 16, PF accumulation reports,NDC,NOC,F&F, PF witdrawl forms.
You can ask the company to adjust notice pay from earned leave in F&F.
If the PF withdrawl froms are not supplied to you, you may obtain from Regional office of PF commissioner and get them countersigned by any of the authorities e.g Bank Manger and submit it to your PF comissioner.
You can lodge your greivance on line also at www.epfindia.gov.in
The episodes mentioned by you were probably the part of exit strategy.
Company may not be interested to prolong and cause bad blood.
Using your resources and by being smart you can make the things happen as suitable to you.