I too had problems with a surveyor a few years back. Completely missed a whole area of significant rot in the wooden topsides. This was discovered by the company who were carrying out a wholesale renovation of all the topsides recommended by said survey.
Not quite so helpfully, this was after they had completed the work they had been asked to do. I contacted the surveyor afterwards and got the usual "what was seen on the day" stuff. However, looking at the paperwork he had provided indicated he was a member of some sort of International Institute Of Surveyors. I actually managed to contact these people who said they would ask their member to respond more constructively. The bloke was absolutely livid that I had contacted them but, lo and behold, he returned to the boat and, eventually carried out this work as well at no extra cost. Conclusion? Occasionally there may be a means of bringing them to book!