Termination and Legal Procedures
Apparently, the termination of your service for alleged absence for three days, bypassing the legal procedure, is unjustified and illegal. On this ground alone, you can file a case against your employer. Engage a good labor lawyer and proceed.
Payment of Dues for 'Workman' Category
If you fall into a 'workman' category, payment of dues on termination has to be made within the expiry of the next working day. Since the company has also failed in this regard, it will be an additional ground of illegality on their part, which should help strengthen your case further.
Regards, Vinayak Nagarkar HR Consultant