I have one of those hard to pronounce foreign sounding names. If the caller cannot pronounce my name, I interrupt and ask them if they are trying to sell me something. They usually say "Yes", or "Well, I'd like to let you hear about this great new product..." At that point, I already have them derailed and confused. I'm sure they are just following some checklist on what to say. In most cases, I simply say, "Sorry, not interested" and politely end the call.