Umm...
As your contemplating entering into a contractual arrangement wherein they seem to feel some legal or policy obligation to validate your creditals... I figure that it would only be fair for you to do likewise... therefore I would suggest that you:
1: Ask to see the log books of all diving personel the company is providing on the trip.
2: Ask to see any information the company may have relevant to accidents on their watch.
3: Ask to see their proof of insurance, limits and proof of currancy.
4: Ask to speak to their insurance rep to validate their claims.
Tell them that it is YOUR policy so as to assure yourself of their capabilities and level of qualifications to provide the service they claim to be able to provide. DO NOT ACCEPT electronic or facsimile documents... insist on originals only. Just 'cause it says "PADI" or "SSI" or anything else on the front door isn't PROOF they are what they claim... any you're putting yourself in THEIR hands when you sign up with them... shouldn't you be allowed validation they're qualified???
... just a though...
5: I'd also ask to see maintenance records on any equipment you may rent... service records on the vessel... and a certified copy of the vessel's last safety inspection.
Now... you and I both know you won't get any of this... but it would be fun to see the look on their face. ... and, one has to ask... "Why should I have to prove to you things you expect me to take on faith?"
Hummm....