are you in the UK or Ireland? I only ask because you mention the HSA - (Irish) Health & Safety Authority, and not HSE - (UK) Health and Safety Executive.
The only reason I mention this is that you need to know where to start next, and if I were you I'd start by contacting whichever body applies and asking them if the company was accredited, rather than trying to chase a company that now doesn't exist.
HSE is here:
http://www.hse.gov.uk/
HSA is here:
http://www.hsa.ie/eng/
Good luck!