Nusli Wadia, friend-turned-foe of Rata Tata and an independent director on three Tata Group company boards, on Wednesday sent a letter to Tata Sons in response to the company's letter asking him to withdraw his legal notice.

In his second letter, Wadia claimed that the salt-to-software conglomerate had not justified its defamatory allegations made against him and hence he would go ahead with the defamatory lawsuit proceedings against the company, Mint reported.