why did ford lie to my sister?

[Dave A]

i guess some ford fans didnt like my last question so ill try again,,her car (brand new)just died on the highway,being a mechanic i can see her altanator stopped working yet they told her it was the battery,when i opened the hood after the fix i can see they put a new alt in the car.why would they lie?are they hiding something.anyone want to by this waste of car from us?who ever said ford giot better needs to go experiance this for themself,,i will never get another ford product ever,forget the fact the cars are no good but the service is even worse,,,