Roy had recently quit the TMC, following differences with its supremo and West Bengal Chief Minister Mamata Banerjee, and joined the saffron party.
On November 13, Abhishek, the nephew of Mamata Banerjee, had sent a legal notice to Roy, claiming that the latter had made "false" statements against him, and demanded an apology from him within 48 hours.
"In our reply to Banerjee's notice, we have demanded that he should withdraw it within seven days and give a written apology to Roy. He should also make it public. Otherwise, we will take further legal action against him and also contemplate filing a defamation case," Roy's legal counsel Som Mondol said.
The controversy over the "Biswa Bangla" brand, owned by the Biswa Bangla Marketing Corporation, has generated a lot of heat in West Bengal since November 10, when Roy, at a public rally, alleged that the brand promoted by the TMC regime was owned by Abhishek Banerjee.
However, the West Bengal government maintains that "Biswa Bangla" is a government brand.
In his reply to the legal notice sent by Abhishek Banerjee, Roy has said the allegations levelled against him are baseless and concocted.
Mondol also accused Abhishek Banerjee of deliberately trying to malign Roy's image.
"My client Mukul Roy has not said those things which Banerjee has claimed. We have never said anything which is not true. We have documents to prove that. Whatever Roy had said was factually correct and he stands by it. Banerjee is trying to malign my client's image as he has recently joined the BJP," he told reporters.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)