General Motors Corporation Did Not/ not willing to Fix Ring And Pinon Noise (warranty) Shafted, rip off Detroit Michigan

My  experience  with  GM  is  that  it  is  one  of  their  favorites  to  tell  customers whose  vehicle  is  still  under  warranty,    that  a  noise  or  a  problem with their  vehicle  is  "normal":

I  took  my  2008  Corvette  ($ 70,000.- car)   numerous  times  to  different  dealerships  because  it  was  having  a loud  grinding  noise  at  deceleration.  At  the  end  the  service  director of  Van  Chevrolet (Scottsdale)   who  had  never  heard  the  noise  told  me  "it  is  normal,  all  the  Corvettes  have  this  noise,  nothing we  can  do  about  it."  A  week  later  I  took  it  to  a  different  shop,   they  found  out  that  the  transmission had  severe  internal   damage.  I  called  the  Van  Chevrolet  Service  adviser to  let  him  know  that  it  was  not  true  what   they  were  telling  me  about  the  "normal  grinding  noise"  -   he  never  returned  my  phone  call.

I  also  reported  a  clunking  and  banging  noise  at  acceleration,  at  least  during  4  different  visits  at  the  dealership,  it  was  never  repaired  or  diagnosed  while  the  car  was  under  warranty.  Now  the  bumper  to  bumper  warranty  is  over  but  GM  wants  to  charge  me  $ 70,-  for  "diagnosing"  the  problem.  At  the  same  time  they  are  saying  that  the  clunking and  banging noise  is "normal"  and  that  it  can not  be   fixed.

They  also  told  me  that  it  is  "normal"  that  the  door  won't  open  if  the  key  fob  is  in the  "wrong"  hand   and  that  it  is  "normal"    that  the  "key fob inside"   warning  feature  also  honks  the  horn  if  there  is  no  key  fob  inside  the  vehicle.

"This  is  normal"   seems  to  be  the  favorite  explanation  and  solution   for  GM  dealerships,  I  even  believe  that  they  learn  this  in  training  and  that  they  are  advised  to  tell  this  to   customers  if  a  repair  is  expensive  or  not   possible  due  to  a  design  flaw.