You may approach a competent and experienced service lawyer expert in such matters, as ap, and show all documents and give inputs in person. It shall be wise to do so.
Let your lawyer take over the matter now arrive at an amicable settlement if acceptable to you or if the bond can be contested without any cost to you.
It is felt that you have not conducted yourself properly. Company can also term your contentions as stories, afterthoughts etc..
You have posted that:
--"I joined an iT company in Jan2011 for 6 months training".
Has company actually provided any certified training which added to your skill/qualification?
The training provided on products, processes, procedures, strategies etc or to better the performance is to be provided by training and may not be rated as training which added to your skill/qualification.
The company shall have to prove the expenses incurred by it justifying the amount to the tune of Rs.1.00 Lac.
--“ Moreover, my project required shifts which were changed every week.”
Did the company announce in advertisement, interview, job offer, selection letter, appointment letter that you shall have to work in various shifts?
Did you ever inform company that you do not want to work in shifts, in writing and can you produce any evidence?
“And i was not comfortable in that environment.”
What was the discomfort faced by you? Was it rude conduct of superiors at workplace or toll the shifts took on your health? Did you report your discomfort to company?
--‘ So i started searching for job and got a job by september and i left my company by just dropping a mail to my manager and HR and dint ask for any relieving letter.”
Did the company issue acceptance of resignation, FNF statement, PF number, PF accumulation reports, form 16, attested copies of PF forms for PF transfer, service certificate complying to SE ACT ?
Did the company issue any communication rejecting to accept resignation?
You may demand all these documents including relieving letter at proper stage now.
--“ Earlier there were few letters from company that were received at home. Later my family stopped receiving letters saying that i dont live there.’
This is probably not an acceptable logic.
Who has signed as witness on bond? If anyone from your family has signed as witness they are expected to inform you.
--“ Now again i received a letter in july from a law agency telling me abt summon in some high court and that i will be charged at 18% interest on bond amount.”
If there is any summons issued by HC, these shall be dispatched by HC.
The law agency may mention that its client is calling upon you to pay the amounts as expressed in bond signed by you or it is under instructions to file a legal suit.
If there is no legal suit filed by company and no such summons are issued then this law agency shall be taken to task by your lawyer.