In a letter to the Returning Officer, state Congress General Secretary S Supongmeren Jamir said the party had represented to the EC in New Delhi on April 28 regarding the "massive malpractices" during polling in Nagaland.
Congress candidate KV Pusa had also lodged a complaint with documentary evidences to the EC, the letter said.
"The party would not be in a position to send any agent on the day of counting till it was assured by the EC that action would be taken on its representations," it said.