You can do the following:
1. pass a Board Resolution explaining that the company has received requests from shareholders that the old share certificates has been torn & hence there is a necessity to issue fresh certificates. The Company can pass a resolution mentioning that all the old share certificates are cancelled & the Company will issue new series of certificates. As such you can issue certificates only to the existing shareholders;
2. send letter to each shareholder requesting to surrender their old share certificates(s);
3. Issue Fresh Share Certificates to existing shareholders
However in case your company is a listed company, prior approval of stock exchange is required & the notice is to be published in the newspaper.