The Securities and Exchange Board of India (SEBI) has received an explosive new whistle-blower letter that may call into question the merger valuation of ICICI Securities with ICICI Bank, which is already subject to contentious litigation. It is reliably learnt that SEBI is investigating the new allegations which are, apparently, backed by verifiable data.    Essentially, the whistle-blower, who calls himself a market participant, alleges that Bank of America Securities India Ltd...