Hello Athina, many thanks for this report.
Currently, abuse complaints come in via abuse@ripe.net. When this is a valid complaint, we investigate the matter, we contact the relevant LIR and we execute an audit on the LIR.
This, read in isolation, could support misunderstandings, at least I'm about to be confused. What nature of "complaints" would initiate an audit? I'm confident that "valid" above means that the complaint has significant indication that either the LIR as such has issues with its existence or legal status or the object maintained by the LIR or the respective assignee has such issues or raises serious doubts, failure to clear which would raise a process violation by the LIR. I'd not read this as "a customer of LIR x sent me spam and therefore the LIR is now undergoing an audit. Thanks, Peter