I have had LOTS of bad/noisy neigbours and it just plain sucks!
All the neighbours that I am having problems with in this building know it's me, or my unit. The people next door have recieved numerous complaints and after them still not being quiet, I now bang on the wall. They sometimes turn it down. And they know it's me. The worst they've done is give me dirty looks. But the management is involved so they wouldn't dare relatiate. Well, unless they want to be evicted or have the cops involved.
If I were you, I would DEFINITELY move ASAP. They're both just too screwed up and should break up if they can't get along. Screaming matches that wake you up froma sound sleep are unacceptable. Unless they get evicted or decide to move in the next week, I would just leave. Get out of that mess! Please.