MCS Limited — non acknowledgement of document receipt

Address:

F-65, 1st Floor, Ma Anandmayee Marg, Okhla I, Okhla Industrial Area, New Delhi, Delhi 110020, New Delhi, Delhi, 110020

I had started a process of retrieving my misplaced share certificates for tourism and finance co. I have sent all the required documents and police complaint for the missing documents.
These documents are sent via registered a. D. And email both to delhi office. After which i have followed up with their mumbai office and email several times. Mumbai office clearly declined responsibility for the same and delhi office does not respond.
We stay in mumbai suburbs and do not know how to address this issue.