I left the company breaking the bond which was due in 1 month.
This is where you made the mistake. As mentioned by @Moo, in the comments, the company is not obliged to issue you anything let alone relieving or experience letters.
Now I am applying for another job and were I require relieving letter of that company, but they are not answering me on the same.
In India, IT companies generally ask for relieving letters, not because they want to a maintain a file containing all the documents of each employee. It is generally for the BGC(Background Verification Check) purposes. Even if you submit a letter, they would go back to the company and verify your claims with them.
I have copies of incentives here the company have cheated on me...
You have some documentary proof that you worked in that company, that's good! Assuming you also have your old salary slips, you could use these documents to prove your association(& experience) with your old organization.
I do not want to get into legal things
Although legal advice is off-topic here and considering the legal system in India, I would say that you won't stand a chance if you went to court. They could easily prove that they would have paid you at the end of your probation, but you broke the bond and absconded!
In conclusion you have the following options:
1) Talk to the old employer and ask whether it would be possible for them to issue the letter after you paid the bond amount. This would work if you are in a position to pay the amount. You could also ask this amount as sign-on bonus from your next employer(if they agree).
2) Let the HR of the next organization know what really happened. As mentioned before, they don't want to maintain a file of your documents, they need it for BGC. Maybe other documents like your salary slips for that period can suffice.
