Somizi Mhlongo. Picture: Somizi/Instagram

'Idols SA' judge Somizi Mhlongo told fans his book was the best selling autobiography in Exclusive Books' history, but then the book retailer said it wasn't.

Exclusive Books dismissed Somizi's claim that his book, 'Dominoes: Unbreakable Spirit', was the highest-selling autobiography ever sold by the retailer.

“So we have just been told that my book is the highest-selling autobiography in the country ever at Exclusive Books. I wanna break the African record which was set by Harry Potter. Am I being too ambitious? No. I don’t think so, because I have God and you,” Somizi wrote on Instagram.

However, Exclusive Books general manager Ben Williams told TshisaLIVE although Somizi’s book was a big hit, it was “below the numbers needed to break the record” for best-selling biography ever.

“We never discuss sales with the media or even the authors so we did not notify him that his book was the highest-selling autobiography. His book did extremely well, but the highest-selling autobiography was Nelson Mandela’s Long Walk to Freedom and it (Somizi’s book) was below the numbers needed to break that record,” Ben explained.

Despite this, Ben said Somizi’s book was a “best-seller” and continues to rake in the sales, two and a half months after its release.

“It was the best-selling book for at least two weeks after its release and even now it is still in the top three most popular titles sold,” Ben said.