The party also demanded the sacking of Defence Minister Manohar Parrikar for "misleading the nation on the OROP issue and pushing Ram Kishen to commit suicide with his irresponsible attitude."
Amid statewide protests by Congress workers, Singh, who led a 20-member delegation of party leaders and ex-servicemen, urged the Governor to convey to the central government his party's concern over the brutal handling of the situation in the wake of Grewal's suicide.
Grewal, along with three of his companions, had come to Delhi apparently to submit a memorandum to the Defence Ministry over the issue of 'One Rank, One Pension'.
Alleging "total breakdown of democratic systems" in the country, Singh expressed "shock and anguish" at the events following the suicide and demanded exemplary action against those guilty of harassing, detaining and beating up Grewal's family members.
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"The suicide of Grewal over the OROP issue had come as the last straw for the armed forces, whose morale had hit an all-time low as a result of the downgradation of their ranks by a recent Defence Ministry notification and the discrimination meted out to them by the 7th Pay Commission," the state Congress president said.
"As ex-servicemen we can feel the pain of the men sitting at the borders," Singh said with Lt General (retd.) T S Shergill by his side.
Coming down heavily on the Defence Ministry and Delhi Police, Singh said the "shocking police crackdown" on Grewal's family members had "pained the conscience of the nation".
"Nothing can justify the barbaric behavior of Delhi Police, who did not spare even AICC Vice President Rahul Gandhi and also repeatedly took him into illegal detention when he tried to meet the bereaved family to extend his sympathy and support," he said.
"We stand by them (Grewal's family) in their fight for justice against the blatant and shameless murder of democracy in the national capital of the world's biggest democracy," he said.
In an annexure to the memorandum, the ex-servicemen expressed their solidarity with the national and state leadership of the Congress "in their campaign against the unjustified, unwarranted and inhumane behavior of Delhi Police, acting at the behest of the central government".
The delegation also included AICC general secretary in charge of Punjab affairs Asha Kumari, former Union Minister Santosh Choudhary, PCC senior vice president Laal Singh, Leader of Opposition in Punjab Assembly Charanjeet Singh Channi and MLA Pratap Singh Bajwa.