Standard Chartered Bank — fraudulent encashment of dividend warrants by impersonation

My grandfather was a shareholder in hindustan unilever and he passed away in 1981, death was communicated to the company (Which was acknowledged by their erstwhile brooke bond ltd) but dividend warrants were sent till 2006 and out of them 30 dividends have been encashed, 4 are traced to std chtd bank as dividend banker. Apart from follow up by hul, a rbi ombudsman complaint was filed. Sc are leading the investigation but it is heading in the direction to protect the encasher and are stating that they are not getting the co-operation without sharing any evidences and hence unable to secure end beneficiary bank details. Moreover they are going to the extent to mention now that the encashed cheque might not have been really paid at all this is the extent they are willing to go down to protect the encasher from criminal offence. Any help in this regard would be welcome
My mail id is [protected]@yahoo.com