Please write to your HR team or the Head of HR requesting a release on the humanitarian ground and offer to buy out the remaining duration of notice period that you didn't serve.
Attach documents that states your Mother's health as critical when you left and if possible share the hand over that you did.
No matter what, please do not complain. Just remain patient . If you need us to help you out with the letter, share a draft that you would send them, we can guide you on that.
Send that letter as a registered post .
Wish you all the best!
20th May 2016 From India, Mumbai
That will help in terms of good references,documents.
Get in touch with your HR of this company where manager is being harsh and have a personal interaction with them
Point out that in your complete service,there was good output and no problems at all.
I am sure that other team members have a poor opinion of this sadist manager as you term it.
HR will be knowing of reputation and proper patient talk will help you secure relief documents.
21st May 2016 From India, Pune