ROKSO is the Register of Known Spamming Operations. It is a list of groups that have been disconnected from more than 3 different networks for spamming. ROKSO is a little bit different than most of the Spamhaus lists. The listings themselves talk more about the background of the listees and less about the specific emails that are the problem.
Many ISPs and ESPs use ROKSO during customer vetting processes.
Networks can be listed on ROKSO without any mail being sent from those networks. These listings are as much about just categorizing and recording associated networks as they are about blocking spam.
Spamhaus does not accept delisting requests for ROKSO records. In order to be delisted from ROKSO there must be a 6 month period with no spam traceable to the ROKSO entity. After that 6 months the listee can petition for a review of the record. If the spam has stopped their record is retired.
In my experience there is often a lot of research put into each ROKSO record and not all that information is made public.
The only time a record is changed is if Spamhaus is convinced they made a mistake. This does happen, but it’s not that common. Given the amount of research that goes into a ROKSO record, there is a fairly high burden of proof to demonstrate that the information is actually incorrect.
It is possible to get delisted off ROKSO. In all of the cases I know about, the listed entity either got out of email altogether or they radically changed their business model.