According to New York's Daily News, 50 (born Curtis Jackson) made the accusations during an interview with British based magazine Uncut.
Both rappers' released their third solo albums last week. As of Friday, Nielsen's SoundScan figures showed that West's Graduation had shifted 600,000 discs while 50's Curtis had reportedly sold 430,000 copies. Over the weekend, several music industry trade publications like Billboard and Hits have estimated West's projected sales around 800,000 copies, with 50 selling in the range of 600,000.
Billboard's Geoff Mayfield countered 50's claims saying that there is a slim chance that Def Jam would have doctored the sales figures.
"The people who built SoundScan put safeguards in place to track sales that don't look kosher," Mayfield explained.
Representatives for 50 Cent and Kanye West did not return calls when contacted. Ironically, both artists are tied to the same corporation, Universal Group, which owns Def Jam and Interscope.