last year, i - without having a facebook account - tried to get the data facebook might have stored about me through the corresponding EU privacy protection law

last year, i - without having a facebook account - tried to get the data facebook might have stored about me through the corresponding EU privacy protection laws. all i got was the answer that they do not compile custom data exports upon request anymore and that i would have login into my facebook account [sic] to any data through some data downloading service... now i wonder if i should have pestered a bit more, i.e. by demanding the release of the possible stored data (which definitely exists seeing the "please join"-spam from some years ago) in writing through snail mail. anyone had any success with that?