Former Vanuatu Prime Minister Barak Sope is hoping to overturn election results in at least three seats.
Mr Sope says his Melanesian Progressive Party is taking legal action against the Electoral Commission, which he has accused of fraud after their candidate was relegated to eighth in a recount in the seven seat Santo constituency.
Vatambe Reme had been second when the declarations were made on Monday last week, polling around eight votes.
But after the Union of Moderate Parties complained the Electoral Commission says an error of 401 votes had been discovered.
Barak Sope says this is an unbelievable results.
"It's all fraud....I mean they must have taken away the four hundred votes and burned them or done something to them.."
The MPP won just two seats in the election, but Barak Sope says they will challenge the results in five constituencies, and hope to win at least three.
The party won four seats in the 1998 poll.