The handling of the USD 1.17 billion compensation slapped by an arbitration panel over breach of agreement with DoCoMo is said to one of the triggers for Tata Sons sacking Mistry last month.
Meanwhile, N S Rajan and Nirmalya Kumar resigned as non- executive directors on boards of Indian Hotels Company and Tata Chemicals respectively, days after Group Executive Council set up by Mistry was disbanded.
"Insinuations that the Docomo issue was handled under the watch of Mistry in a manner inconsistent with Tata culture and values are baseless. The suggestion that Ratan Tata and the trustees would not have approved of the manner in which the litigation was conducted is contrary to what transpired," the statement said.
Responding to the statement, a Tata group spokesman said: "The insinuations are being imagined and this (DoCoMo) matter is sub-judice."
Stating that a number of discussions on the DoCoMo issue were held in the Tata Sons board, Mistry said he had "always mentioned that the Tatas should honour all commitments within the law. This stance is based on Tata Sons' board view and was always consistent with the series of board meetings in which the Docomo issue was discussed."
that struggled to grow subscribers quickly and sought Rs 58 per share or Rs 7,200 crore from the Tatas.
But the Indian group offered Rs 23.34 a share in line with RBI guidelines that states that an international firm can only exit its investment at a valuation "not exceeding that arrived at on the basis of return on equity".
The Japanese firm then dragged the Tatas to international arbitration where it won a USD 1.17 billion award.
Tata Sons has said they will resist enforcement of the arbitration award in India as also other jurisdictions as it has been barred by Indian law and public policy.
"They also participated in the meeting with the legal counsel (who also happened to be a trustee of the Dorabji Tata trust) and who represented Tatas in the litigation. At all times, Ratan Tata and Soonawala concurred and approved the course of action adopted by the Tatas and as advised by legal counsel," it said.
"In light of the above facts, to suggest that Mr Mistry acted on his own, or contrary to 'Tata values', or without the knowledge and/or concurrence of Ratan Tata and Soonawala is as false as it is mischievous," the statement by his office added.
Rajan resigned as a non-executive director with effect from October 28, Indian Hotels Company Ltd said in a BSE filing.
In a similar intimation to the bourse, Tata Chemicals said Nirmalya Kumar, non-executive director, has resigned from the company's board with effect from October 31, 2016.
Rajan, Kumar and Madhu Kannan, another member of the erstwhile GEC, had quit the Tata group last week.
Last week, when the ouster of Mistry by the Tata Sons board was announced, the GEC was also disbanded. Tata Group's website removed all the details related to the GEC, including profile of the members.
