Local BJP leaders Lalji Patel and Arvind Kapadia also appeared before Additional Civil Judge of Kadi taluka court H J Tanna and filed replies through their lawyers.
The next hearing in the case will be held on February 29.
Congress had filed a complaint with the election authorities during the 2007 Assembly elections campaign that Nitin Patel, who was BJP candidate from Kadi, had made derogatory comments about Congress leaders at a rally in Luharkui area of Kadi town. Lalji Patel and Kapadia were named in the complaint as organisers of the rally.