In response to this news, the company have released a full statement which you can read here.
Within the response, the company state "We have never found a case of modern slavery in our supply chain. But we do find instances of illegal child labour occurring on the cocoa farms where we source our beans. We have always been 100% transparent about this. And fully clear that it is not acceptable. Which is why we actively look for instances of illegal child labour, so we can proactively solve them."
They also state "We welcome any challenge and debate that helps to raise the bar in the chocolate industry and gets us closer to making 100% slave free the norm in chocolate."