Hi Purushotham, A - You haven't mentioned what exactly was the problem that led you to leave the company after 3 days.
Doubts from Day 1
B - If you had doubts from Day 1, then you should not have signed the bond and joined the company.
Purpose of Employment Bonds
C - The reason companies keep such bonds is to ensure that employees who join do not leave the job. In your case, it was for 3 years, and you should have respected the bond properly and asked for leave for a few days if the personal issue was significant. I am sure the company would have allowed you to take a short leave and then return, considering it was only 3 days.
Consequences of Breaking the Bond
D - Now that you have broken the bond, you may be liable for legal action if the company decides to pursue it.