Employees violating the bond clause in the Agreement what to do.

We Ingenious e brain solutions is organization based out in Gurgaon and is register under the company ACT. We at Ingenious e brain Solutions as a general practice takes an undersigning of Bond from the employees with reference to the employment time which vary from employee to employee based on the mutual concern and is usually of 1 to 3 years. We have quoted a amount in the bond document in case the employee break the bond and the bond can be nullified on mutual concern of both the parties. In recent experience we had two to three employee who has violated the bond and they left the organization without prior notifications and even they have not served the notice period. As a clause we have mention that they are not going to join a competitor and one of the is working with one of our competitor. We look forward for your assistance in this matter. We as an organization would like to take strict action against the employee so that this could not be a general practice for