Went in to get my muffler looked at for rattling. ...

Went in to get my muffler looked at for rattling. Told the person the rattling is coming from inside the muffler. When I got to the dealership I told them that I don't want it being serviced unless its covered by warranty. I leave, and get a call 4 hours later stating that the muffler isn't covered under warranty and it'll cost $1,350 for a new one (Ridiculous). I tell them no thanks and that I'll shop around. Get to the shop and they tell me I owe them $140. So basically I payed them $140 for them to tell me what I already knew (baffles bad inside muffler). I got the response that "there isn't a way of knowing what's covered until we test what's wrong". I'm in disbelief, considering everything I had told them. I didn't know they couldn't call the place and say "hey, is the exhaust system covered with this extended insurance plan?". Such a waste of money and time!