That's unfortunate. I can only assume it's due to them being so busy (seems they have a receptionist now?). I recently discovered a broken wheel stud on my mother-in-law's truck and was hoping to have Minute Muffler take care of it, but since they were so busy they couldn't fit us in until the following week (called on a Thursday, MIL needed to drive home Saturday). They did however take the time to give me a referral to another nearby shop that was able to take care of it.
Minute Muffler is still my go-to shop as to date I've had an exhaust system replaced, clutch replaced, and an insurance inspection done (complete with replacement of an upper control arm to get the car to pass) and have been completely satisfied.