Full and Final Settlement

I worked in a company as Management Trainee in sales and marketing for 5 months, from 3-July-2017 to 3-December-2017. Altgough, it was not required to serve the notice period by a management trainee yet, I gave a formal notice on 15-November-2017 to my reporting manager and HR deparement via email. The effective date I stated for my resignation was 4-December-2017. My resignation was recorded on 16-December-2017 and I received an email stating that I have to get clrarances from all the departments within 2 months after my resignation has been recorded or else I will not be entitled for full and final settlement. Again by the end of December 2017 I received a registered mail from the company's VP of HR department stating that I have to pay the company Rs. 1 lakh as a penalty for resigning, as the company accrued expenses on my induction and training. I replied to the same via registered mail dated 27-December 2017, citing the relevant clauses from the agreement I had signed during my induction, and made it clear there itself that i am not at all liable to pay the sum of Rs. 1 lakh. I also asked them to pay my salary for the month of November 2017 (salary cycle from 22 Oct 2017 to 21 Nov 2017) and unpaid expenses for the month of October and November. Recently I came to know that the company is seeking to send a legal notice to me. Moreover they have not yet replied against the registered mail which I sent. They are not doing any proceedings regarding clearances, as it is their internal affair, I can't influence it directly. One month is about to pass and still I have not yet received full and final settlement. I do not have anyone to guide me so please help me. I need that money as I worked hard for 5 whole months and I need that money for my studies and. Please help me.