You need to apply to the company to issue duplicate share certificates to you.
The company will send you the list of documents and the process you need to follow, which includes – issuing affidavit, surety, and indemnity bond agreement. Next, you should file an FIR and publish an announcement in the newspapers and government gazettes. You would need to accept the cost of the notice publication and franking.
Once the company receives all the documents, they will issue duplicate certificates. These certificates will carry the word ‘duplicate’ on them.