Following news that the music streaming service Tidal has passed three million paid subscribers globally—around 1.35 million of which have signed to its pricey lossless tier—owner and renowned rapper Jay Z is reportedly preparing a "giant lawsuit" against its former owners.

According to an article in Norwegian business newspaper Dagens Næringsliv (Today's Business), several of Aspiro's (Tidal's parent company) former owners received letters claiming that some aspects of the company were misrepresented. In particular, it accuses Media group Schibsted and VC firm Verdane of exaggerating the number of subscribers the service had when Jay Z's Project Panther Bidco company bought it out at the start of 2015.

The figure Project Panther Bidco was given—503,000—was "misleading," according to Bidco, with the company also claiming that the business was in worse condition than had been revealed. Bidco is reportedly trying to claim back a sum of 100 million Norwegian Krone, or roughly £8.3 million ($12 million).

A spokesman for Schibsted told Dagens Næringsliv that the company was "unsympathetic" to Jay Z's letter. A later statement to Swedish site Breakit said: "We want to point out that [Aspiro] was a publicly traded company that was acquired, [which means] transparency of financial reporting [was required]. Otherwise we have no comments."

Several other former shareholders went on the record to Dagens Næringsliv, saying they have received letters, but are "quite puzzled" by them.

Tidal, which gushed to prominence with a strange, self-serving and star-studded launch in March of 2015, has attracted its fair share of controversy since. After promising to "change the course of music history," Tidal soon found itself under fire for an "almost all white" staff picture (which was later revealed to have been taken in the company's Norway office), with Twitter users hitting out at Jay Z.

Earlier this year rapper Kanye West was reportedly considering legal action against the Pirate Bay after his Tidal-exclusive album The Life of Pablo was placed on the service, receiving hundreds of thousands of downloads within hours. Most recently, artist John Emanuele included Tidal in a lawsuit against music streaming companies, claiming that Slacker Radio, Tidal, and Google Play have all ripped him off by not paying the necessary royalties for his songs.

Kanye, at least, seems to have made up with Tidal, recently claiming that The Life of Pablo had been streamed 250 million times in its first ten days on the service.

Update: A Tidal spokesman has issued a statement, confirming that the company has launched legal proceedings.