To me it appears that you have an unswitched socket with a double pole light swith unit.
What make is the unit ( I have my French, and English certificates and have worked all over the world as an Electrical Engineer
It depends where you are! In London the callout charges are anything from £65 - £100 for the first hours work, then after that the average is £40/hour.
Remember there are now THOUSANDS of eastern Europeans around who can always do you a cheap job, and when it all goes wrong...