In a letter to SEBI, Vodafone has also asked the market regulator to investigate the reverse listing of ISL into Essar Telecommunications violated the country's insider trading rules.
Shares in ISL, which is Essar group's financial arm, have risen more than tenfold in the past 12 months.
The British firm had objected to the merger between the two Essar group firms on Tuesday, saying ISL's value may be inaccurately used to calculate the value of its Indian telecom joint venture Vodafone Essar.
ISL had said in June last year that its board had approved the merger of Essar Telecommunications, which owns an indirect 11 percent stake in Vodafone Essar.
In a letter to the regulator, a copy of which was marked to the Bombay Stock Exchange, Vodafone said inadequate information had been given in the merger scheme, and also pointed to the jump in ISL shares between January 2010 and January 2011.