"She held a media meet and announced major schemes, thereby violating the model code of conduct which is in place for the by-poll," said Mannan.
The Congress leaders, including state party chief Pradip Bhattacharya, also drew the the attention of the Election Commission to advertisements published in newspapers by the Trinamool Congress government to celebrate its completion of two years in office.
With the Trinamool and the Congress snapping ties at the central and state levels, both parties have put up candidates for the seat. While the Trinamool has nominated former international footballer Prasun Banerjee, the Congress has given the ticket to advocate Sanatan Mukherjee. The Left Front has fielded CPI-M's Srideep Bhattacharya.
The election to the Lok Sabha from the constituency was necessitated by the death of Trinamool parliamentarian Ambica Banerjee April 25.