The Aam Aadmi Party, which finished a distant third, too, made similar allegations against the Congress party. AAP nominee Maj. Gen. (retd) Suresh Khajuria accused the Congress party of using "undemocratic means" to win the byelection.
None of the parties offered any evidence to support their allegations.
Congress party's Sunil Jakhar won the bypoll necessitated following the death of BJP MP from the seat, Vinod Khanna, in April. Jakhar defeated BJP's Swaran Salaria by over 1,90,000 votes.
"They won by misusing the machinery. Everyone knows that even the sarpanches owing allegiance to the BJP and the SAD were warned that they will be dealt with strictly if the two allies got a lead in their respective areas in the bypoll. Civic body officials, too, were warned," Joshi alleged.
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Joshi and Salaria, however, said they will now request Jakhar to ensure the development of Gurdaspur constituency.
Senior Shiromani Akali Dal leader Prem Singh Chandumajra said: "It is not a victory of democracy, but it is victory of government machinery being misused."
AAP's state unit president Bhagwant Mann said his party accepts the mandate and will introspect the reasons for the defeat.
Contrary to Congress party's claims, Mann said the bypoll outcome would not set the tone for 2019 general election.