Claim settlement of deceased father

My dad came to Kolkata few years back and opened an account in SBI bank in which I was registered as a nominee.. now after his death I had to come from Chennai for claim settlement of his account. After 20days of struggle now again BM gave a new set of forms & asking for surety of two people having atleast 4lakhs in their account.. being new to this place I hardly know anyone who would agree for the same kindly guide me.. and I also want to know the rights of a nominee.. According to rbi.org.in..(In such case, therefore, while making payment to the survivor(s) / nominee of the deceased depositor, the banks are advised to desist from insisting on production of succession certificate, letter of administration or probate, etc., or obtain any bond of indemnity or surety from the survivor(s)/nominee, irrespective of the amount standing to the credit of the deceased account holder.) But I had to submit all these.. kindly guide me as to