For anyone with access to the BBC iplayer radio app or BBC website I would urge you to listen to a wonderful recent episode of Ed Reardon's Week, following the exploits of a curmudgeonly 50-something writer described in the show's publicity material as an "author, pipesmoker, consummate fare-dodger and master of the abusive email" 

Written by the wonderful Christopher Douglas and Andrew Nickolds this hilarious episode highlights the challenges organisations face with collecting customer feedback in a gig economy and serves as a salutary lesson to anyone running such campaigns.

Have a listen here;- 

http://www.bbc.co.uk/programmes/b09fy5xg