The Ghostbusters are the ballsiest bunch of ghost-fighting scientists/SNL refugees in the business. Much like Stephen Colbert, they ain't afraid o' no ghost. Once the Ghostbusters have captured those freedom-hating ghoulies with enhanced laser blaster techniques, they detain them indefinitely in a ghost-tank, wherein Habeas Corpus does not apply
While you can call them, they are also available via email; However, the line "Who you gonna email?" just didn't jive with the rest of the song, and was omitted.