Dear Colleague,
The fact is that you are breaking a bond that was agreed upon and are now ready to compensate as per the agreed clause. In the future, kindly refrain from entering into such a "bond system," which is often used unfairly in our country. Secondly, never deposit your original certificates with anyone. If such a demand arises, reject those offers and seek better employment contracts.
Make every effort to retrieve your certificates and then provide an Account Payee Cheque, etc. Both actions should occur simultaneously.
In the current situation, you may send a legal notice to them if they do not respond within a reasonable time frame. Pursue legal action if they continue to ignore the legal notice. They will likely comply.
Thank you.