Original sale deed partially damaged at Bank's custody

I took home loan against my flat few years back from a well-known bank and successfully re-paid and pre-closed the loan. Now bank send an email that the Original documents has partially damaged due to fire occurred at their vendor facility who is authorized vendor to keep original documents in safe. They mentioned that, Bank will issue certified copies along with supporting documents prepared by their legal team. This is broken my heart and I put my sweat and blood to pay EMIs on time without single payment delay and able to pre-close the loan prior to tenure completion. Here are my questions, Should I accept their proposal for providing certified copies? Will these copies valid just like original, should I able to perform future transactions without any issues? What are my legal options to sue this bank for causing damage to my original documents? This is not only my problem, I guess this will be slowly pop-up in coming years for others too..! Requesting expert advice on this sir. Thank you.