I call bullsh**. There is absolutely no reason to replace glazed clutch pads, although they diagnosed the issue correctly they don't know how to fix it correctly. Glazed shoes are super easy to fix, just get the clutch off and you can simply "scuff" the glazed pads with some 60 grit paper. Good to go. Same thing with glazed brake shoes. They glazed the more slow speed driving you do, lots of stop and go = lots of glazing. It's something that is VERY easy to do in your own garage. The only "special" tool you need is an electric (or air) impact wrench to get the clutch nut off. I would avoid that shop, if they just want to replace clutch pads where they are perfectly fine, I couldn't imagine what else they might want to replace thats "broken".