Oh wow.
These pricks knew full well what they were doing was illegal and took steps to try and prevent being traced:
In the PDF, Page 10. para 47, aggravating features: (Regarding CLI presentation of 0844337 and 08454290 numbers)
"Whilst the CLI's(sic) used were legitimate, they did not identify the company making the call. The CLI's were routed through Buenos Aires making it difficult to trace the company"
It's interesting that the ICO managed to stop the liquidation of the company. This means they must now be paying attention to Companies House activities.