LONDON -- J.K. Rowling is not shy about calling people out on social media.

SEE ALSO: 24 times J.K. Rowling was a total badass on Twitter

In a clearly exasperated tweet, the novelist includes the link to a website featuring her image along with a warning: "Don't waste your money, people."

The website purports to offer three-day workshops that help participants "Become an Author and Show You How To Double... or Even Triple... Your Income!"

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Rowling's photo appears alongside several other famous faces beneath the statement: "For over 20 years I’ve had hands on experience working with and educating businesses and individuals, in over 27 countries around the world, about personal peak performance, business growth strategies and becoming successful authors."

Original image replaced with Mashable logoOriginal image has been replaced. Credit: Mashable

"Look, I don’t blame you for being sceptical… All those hyped-up, over-promised sales pitches out there can make you a disbeliever… and yes, they annoy me too. But this is different - A lot different!" the website reassures.

Mashablehas reached out to the website in question for comment, but has not yet received a response.

In the meantime, if you wish to reserve your place at one of the workshops, best to hurry because according to the page's time-ticker, "the REMAINING tickets won't last long!" (unless you refresh the page, which starts the timer over).