Great info.
There are a lot of people who have no idea how to start resolving issues. As the owner of retail stores I know this first hand.
One part that should be be discussed in more detail is who is really at fault. I find that a large amount of customer complaint aren't valid. I think its fair to say that with a small business more then 50% of complaints are due to the customers bad attitude or more importantly their lack of education on what they are buying. Then you run into the people that do, say, or fabricate lies just to return something they don't want or need. I have found these are the people that yell the loudest.
You may want to add to your well written info, a guide on how to decide if their rights as a consumer have been violated or if they are being unreasonable. You may also want to go more into depth and equate the same situations from the merchants point of a bad customer.
These are just suggestions to improve an already excellent sight you have put together.
Nice Job!