Front wheel stud fatigue failures

Brought my '04 Highlander in for oil and filter replacement 2/1/2012.
During Toyota's Service Department's usual check for other stuff (tire
wear, fluids, battery, etc.) they broke two studs on the front left side
when they were reinstalling the wheel. They showed me one of the studs
(I kept it) and said they'd replace them for free.

Got home and took a closer look at the broken stud. Now I've spent
forty-two years in aerospace in Metallurgy and Quality Engineering. I
know a fatigue failure when I see one. This broken stud was a fatigue
failure that had begun much earlier than last Thursday. Here's a picture
of the fracture face:

So if two of them broke prematurely, the others are suspect. I brought
the car back in Thursday to have all the remaining studs replaced. They
were short four, so I got an estimate of about $159 and said I'd be back
Friday.

Yesterday (Friday) I took it in and had ALL the remaining front wheel
studs replaced. The cost was $171.88. Huh? They charged me for two lug
nuts they said were "missing." If the lug nuts were present Wednesday
and missing Friday, then THEY lost them. Either that or they sent me
home Wednesday missing two lug nuts on the left front wheel. They had to
have been there then or else they couldn't have broken the studs when
they were reinstalling the front wheels. Still waiting on an answer for
that. Seriously, I need to find a new Toyota service department.

Ed Maier
Arlington, TX