You mentioned about signing 2 years bonds, so what are the consequences of breaking the bond?
What are your dues if you leave before 2 years?
What the company owes you if they terminate you before 2 years?
What does your separation policy speak?
Did they give you any training? Material? Class room or practical training?
Before mailing your resignation, did you mention about it to your superior / manager / HR?
What does the mail from HR on your personal account say?
7th October 2013 From India, Mumbai