Yes that is a problem. Because I dont know for sure which certification organization it was. And the current owners at The Whaler use the same name company but different people. Also they say the old Whaler burned down in 2010 and they "lost all documentation' in the fire.There seems to be an assumption here that you certified through PADI. Do you recall if that was true? There are multiple dive agencies out there, though PADI certifies the majority of divers.
If it's PADI and you can't find it, you could message me with your name and date of birth and I can poke around for you. On your name, it's best to get full first and last name and middle initial. If you might have used a nickname when signing up for the class (e.g., if your name is Aleksanteri but you are called Alek), let me know.
To be honest, my best guess is the shop saved themselves a few dollars/euros/meticals by not actually paying the agency (PADI, NAUI, or whomever) for the card. Thus the agency may have no record of you....
Something sounds fishy here no pun intended. If someone has been certified its not just on paper right..?