Full & Final amount and Notice period

Hi Experts, last year i left the Job due the bad financial position of the company. company was not paying salary on time. it was delayed by 1 to 2 months since 2013. that's why i had to take the decision of leaving the company..at the time of leaving the company my notice period was 3 months....and i served for only 1.5 month..and company adjust the remaining notice period with my salary. but did not pay on time that too. i waited for waited for the 7 months to get the amount..now the company has changed the policy and converted 3 months notice period into 1 month of the existing as well new employees. i resigned in month of Feb-2016 and god the full & final amount after 7 months. please advice can i file a case against them on basis of following points... (1) I resigned from the post as company's financial position was not good. (2) company was not paying salary on time since 2013 (3) company has changed the notice period from 3 months to 1 month after my resignation and exit from company. (4) company did not pay the full final amount with interest as it was paid after 7 months.. If i can then kindly suggest me the case law on the basis of which i can talk to them..