*UPDATE*
Hello everyone
It seems PADI have done absolutely nothing about this instructor as he is still running his shop, still "teaching" and presumably still putting peoples' lives at risk, so I have decided to let you all know details.
The dive shop is in Cartagena, Colombia, and it's called 'Buzos de Baru'. The instructor's name is Juan Jose Chavarriaga and his Padi OWSI no. is 177004. Here's their website:
Buceo en Cartagena - BUZOS DE BARU
If anyone knows of any way to get PADI to take this seriously it would be appreciated.