she was just having dinner when a GIS guy rang the door bell and came in before she could say anything.
Do these guys have legal right of entry in Austria? TVL inspectors here certainly don't, even though they might try to imply that they do. Basically, if they don't have a search warrant you can tell them to "go away" and slam the door in their face. If they try to force their way in, then you have every right to use "reasonable force" to stop them.
I was just reading an interesting piece in an old journal about German radio licensing in the 1930s. I'll copy and post later.