Time to quit grousing and get in behind the work! No, not that "Work," but a PCG-focused initiative being promoted on the Living Armstrongism blog. The entry there explains itself, please do click across. My own inclination would be to do a Readers' Digest on the example letter: short is often more effective; but the strategy is sound. Unless the company is owned by a PCG member, this kind of feedback has a good chance of being effective. We can all grumble and trade horror stories, but here's a chance to get in there and raise a little righteous hell.
Kudos to Redfox712