Hello Annie
It's disappointing that you have had this experience, and surprising that a shop says they won't tackle it; there is nothing unusual or out of the ordinary in Club Tour build and components - Thorn's strength is in matching together well-proved and reliable components, rather than hard-to-sort unusual kit. Have the shops gone so far along the route of external bottom bracket bearings and double chainsets that they no longer have the tools for traditional (and many would say better) bearings and components?
It would be useful to know something of the history of the bike and previous repairs. What exactly is wrong with it? In my (limited) experience, bikes that have been bodged (e.g. threads stripped, bolts of sockets stripped, threads crossed or bent) are much harder to fix, and need more 'out of the box' thinking, tools and experience. Neighbours sometimes see me working on family bikes, and bring along something from their cellars with seized seatposts, bent brake components etc to 'have a look at' . . . . .
Having said that, the majority of things can be fixed. Good luck!
Lewis