(Bloomberg) -- Elon Musk said Twitter Inc. misrepresented the size of its user base to distort its value and then “played a months-long game of hide-and-seek” as he sought more information to complete the $44 billion purchase of the company.

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Musk’s arguments for abandoning the deal were revealed in counterclaims filed under seal in a Delaware court last week. Twitter misled investors and the US Securities and Exchange Commission, Musk says, and the company was “frantically closing the gates on information in a desperate bid to prevent the Musk Parties from uncovering its fraud,” according to the filing reviewed by Bloomberg.

Twitter responded by saying that the idea that Musk, backed by a team of lawyers and financial advisers, was “hoodwinked” into signing the purchase agreement was “as implausible and contrary to fact as it sounds.” In a 127-page reply, the company said Musk created a story “to escape a merger agreement that Musk no longer found attractive once the stock market -- and along with it, his massive personal wealth -- declined in value.”

The exchanges are the latest volleys in the acrimonious legal fight between the social-media platform and the world’s richest person. A judge in Delaware has set a 5-day trial in October over the merger, after Twitter filed suit to force Musk to go through with the deal.

Read More: Twitter Hits Back at Musk, Suing to Force $44 Billion Buyout (2)

In his counterclaim, Musk is described as “an avid Twitter user who believes in free speech and open debate, and he appreciates Twitter’s role as the world’s town hall.” But fake and spam accounts were a “key issue” for Twitter and the company wasn’t doing enough to identify them.

According to preliminary expert estimates by Musk’s side, “in early July fully one-third of visible accounts” -- those that publicly tweet, re-tweet or like tweets -- “may have been false or spam accounts.”

Further, Musk says Twitter’s disclosures show that the actual number of monetizable daily active users, or mDAU as the industry calls it, is 65 million less than the 238 million Twitter has represented. According to Musk, Twitter also misrepresents how many of those users view advertising, the company’s main source of revenue. By his estimate, fewer than 16 million users see the majority of ads and should be counted as “monetizable.”