From SPU (small airport) on SAS, the SA site shows no lounges available. It's a contract lounge that only accepts Lufthansa and Croatia Airlines passengers.
There are only a few Star Alliance lounges around the world. There are many lounges run by the different member airlines. There are also contract lounges that some Star Alliance airlines have access to, but not all members. Many small airports have no lounge at all.
Star Alliance isn't a company, so there is no one to call. The SAS lounge people gave you the correct information.