Here is an example from ramesh_mbabu for us. Ramesh wrote on the central government's online grievance system (DPAR's PG Portal), and he did hear from them (see below).
Many government bodies now have online mechanisms to take in complaints, and from experiences we hear, many of these work. Work as in - you get a response back, though a good # of responses could be generic (thanks for the note, we will do something - type of thing). But even for the grievance redressing systems that work, we have heard that very few citizens actually use them. Why? Perhaps lack of awareness.