If register share holder loss/missed share after long time any person claim but not any proof of doc

MY CLIENT SHARE HOLDER OF EICHER MOTOR AGED 81 YRS. SHE MISS/LOST YOUR SHARES THEN GO FOR DUPLICATE SHARES. LAST 6 MONTHS RTA NOT GIVEN  SHARES. THEY ASKED 2 MANY PERSON CLAIM YOUR SHARES. IF YOU WANT GO FOR COURT. BUT THEY ARE NOT GIVEN  ANY PROFF/TRANSFER FORM & PAYMENT AGAINST PURC HASED DETAILS. THEY ONLY SAYS ONLY LETTER RECEIVED NOT ANY PROFF.  THEN HOW CAN GO FOR COURT & WHICH PERSON  AGAINST FILE CASE. RTA NOT GIVEN ANY DOCUMENT OF CLAIM PERSON.