Dear Latha, you need to serve your notice period as per the provisions of your appointment letter. There is nothing to "plan" about it. You have written that you "have been hearing from various resources on the non-payment and threat of no relieving letters from the company even after serving the notice period." Let me specify not to worry on this count. On completion of the notice period, if the employer pays you the salary, then well and good. Else, find out the office of the Labour Officer (LO) of your area and give an application to him on non-payment of wages. However, you have to go there personally and explain your problem to the LO. When you go there, carry with you proof of your employment like the appointment letter, identification card, etc.
Please note that LO is different from a labor lawyer. The Government of India as well as state governments have created labor offices to solve the problems of the workers. Since nobody reports to you, under the provisions of the Industrial Dispute Act, 1947, you are classified as a "workman," and this act is in your favor. In contrast, labor lawyers are professionals who work in their personal capacity. They can issue the notice to the employer, and if the employer does not respond, they file a suit. However, a lawyer's services come with a hefty fee, whereas the services of LO are free. Possibly, he may tell you to provide "Chai-paani," which anyway you will oblige. Please speak in the local language while at the Labor Office.
In fact, holding the salary for the month of July 2017 is also illegal. Write an email to him to release the salary. Keep with you the printout of the mail. It might be helpful to you as evidence. If you face any problem, come back again to this forum.
All the best!
Dinesh Divekar