Despite an unhelpful conversation with the Tourist Office in Tenerife which made it clear that they had no interest in helping ripped off tourists, there are quite a few helpful resources that exist to help those that have been the victim of unfair commercial practise.
While there are some good camera shops in Tenerife, there are a lot of cowboys. The most frustrating thing for tourists who have been ripped off in Tenerife is finding some real help in dealing with their problem.