Problem With Relieve Letter

Hi,
I worked for a company. Due to lack of opportunities I had put resignation. I got the resignation acceptance. But to get the NOC or no objection certificate and get the relieve letter the company is demanding a huge amount in lacks as training cost which should be paid back to company. This was not informed through mail nor I have signed a a bond or document mentioning these terms and conditions. But to give relieve letter the company is demanding the huge amount which is not at all possible by me to adjust. Please help me to get my relieve letter from the company. Thank you.
Thanks,
Sandesh

Dear Sandesh.
Have you signed any bond for the training's provided to you? What does the appointment letter say about the exit clause? Has the company informed you in email or letter about the training cost? Have you signed any employee hand book, wherein the same has been mentioned?
Kindly answer these first, so that the query can be answered properly.
Regards,
Ashutosh Thakre

Hi,
Ashutosh,
I have not signed any bond. Appointment letter was not issued at all. Just a mail communication to join the company. Even in that nothing was mentioned. Nothing is signed. Thank you very much for the response.
Thanks,
Sandesh