The complaint said that the use of government-funded media for such messaging gave the ruling party an "undue advantage" and undermined the level playing field essential for free and fair elections.
Citing provisions of the MCC, the complainants said ministers are barred from combining official functions with electioneering and from using official machinery for partisan purposes.
The signatories said the Commission should act swiftly to "uphold the sanctity of the electoral process" under its constitutional mandate.