I had ordered a product that ended up being poorly suited to my older home. The installer showed me why it could create, rather than correct problems. He also made some suggestions. I phoned for a corrected invoice and the amount was promptly deducted and a corrected invoice was sent. Everyone was very professional, while remaining friendly.
A booklet providing easy to understand information was provided prior to the visit by the salesman. This allowed me to ask the right questions. All of my questions were answered.