The recognized medium for reporting and tracking this is ASR-F.
However, the actual number of ASR-F's being filed is pathetic. This is understandable since the form is complex and very time consuming to fill out, at a point in time when you are at your most fatigued
Many of us are guilty of just going home (or to the hotel) and not filling out the ASR-F.
The forms/reporting system are being revised to make them more user friendly. But in the meanwhile, don't waste your time complaining on pprune or in the bar or at home.
Man up and send in the ASR-F, even if it is a few days late.