In a nine-page statement, the promoter of the major operating Tata companies made a point by point rebuttal to the letter which Mistry had written to its board members a day after he was ousted on October 24.
Tata Sons accused Mistry of trying to gain control of the Indian Hotels Co Ltd - the firm that runs Taj Group of Hotels - by using independent directors.
"In hindsight, the trust reposed by Tata Sons in Mr Mistry by appointing him as the Chairman four years ago has been betrayed by his desire to seek to control main operating companies of the Tata group to the exclusion of Tata Sons and other Tata representatives," the Tata Sons statement said.
Tata Sons said dividend from 40-odd Tata Group firms had declined during Mistry's tenure while expenses have risen. It accused Mistry of demolishing the historic management structure where Tata Sons exercised control over its group companies.
Punching holes into Mistry's performance over four years, it listed Tata Steel Europe, DoCoMo-Tata Tele joint venture and Tata Motors' Indian operations as "problem companies" where there was no "noticeable improvement in operations" and the situation has worsened with widening losses, increasing debt and declining market share.
"Even with no turn-around...The only action taken was to write-off huge amounts against these companies," it said.
Mistry had in his letter to the Directors warned of Tata Group firms facing Rs 1.18 lakh crore write-offs.
It lashed out at Mistry's handling of the crisis at Tata Steel Europe and the stand-off with Japan's DoCoMo over the failed telecom joint venture where Tatas face USD 1.17 billion penalty for violation of contract.
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