I contacted them once, via their Contact form at their website. That seemed to go unnoticed.
So yesterday I got mad and emailed everyone whose email address was available on the Harriman House website.
I got this reply:
Dear Mr Cane
Thank you for your detailed feedback on the formatting issues in the Gunther eBook. We are working on updating the formatting and styling of a number of our books at present and will be resupplying them to Amazon shortly to rectify the issues you have experienced.
Harriman House Ltd
I am so happy to get this. I will be even happier if it all comes to pass so I can recommend the excellent Max Gunther books as eBooks!