It seems the trainee has left you for greener pastures. It also appears to me that whatever agreement/bond is executed between you is not properly conceived. When you want to seek help from it, it is proving to be useless.
First of all, please understand that if an employee wants to leave, you cannot stop him and hold him in your organization. The only thing you can ask for is a form of compensation from him for the amount and time spent on his training. Moreover, this compensation can only be asked for if the employee leaves, say, within 2 or 3 years. Additionally, there must be a specific clause to this effect in your agreement/bond.
You also need to support the clauses in the agreement/bond by executing supporting documents such as 'Promissory Note,' 'Post-Dated Cheque,' 'Counter Guarantee from Friend/Relative,' etc. It is not permissible to keep his original documents with you during his employment or after he leaves your services. Legally, you cannot hold his documents with you, as confirmed by Mr. Malik.
The only way to penalize him is by asking him to pay compensation by invoking the relevant clause in the agreement, provided such a clause exists in the agreement. If he is threatening your staff, please file a proper FIR against him at the nearest police station.
Thanks & Regards
Initially, thanks for your detailed reply. We provided a 6-month training, and we have proof vouchers. We have a 2-year agreement and his original certificates. His resignation letter, sent by courier, states personal problems as the reason for quitting. During a phone call, he requested double the payment and is threatening staff with support from his political allies. We are facing a significant challenge here and aim to take appropriate action against him. Please advise on the next steps.