Employment aggreement


New Member

I am a H1b worker.I stayed with my employer for 9 months. When the employer sponsored my H1b visa, I was asked to sign a contract agreement to stay with the employer for 1 year and if I leave the employer before 1yr I had to pay them $10,00 as breach of some 'Liquidity damages'. But there was no loss because of me. Moreover I stayed for 9 months.Now I got a mail saying that I had to pay the $10,00 or I will receive a letter from the lawyer.How to proceed now?
Please suggest.

Thank you in advance.