Thrifty Car same cheap car rental rates only trap if.. Denver, Colorado

Thrifty Car  rental advertised  very good  prises for  car  rentals, but  thos prises  just look  good , in reality  bill  came  out  olmost  doeble  prised  compare  to  my reservation  conformation I did  on  line.At  service  location, 09/07/12 in  Dnver International Aiport, I was  given  rental agreement  with additional/optional services I did  not  requested and Idid  not  wanted,

I did not  sign   those additional serviced on paper-  they  were  added on 5-6 electronoc  pages  of  agreement  when I  was  need  to "accept"  on  touch  screen,  and  was  not even   time  to read  all that ammount  of agreement  on 5-6 electronic  screens  when  line  of people were  behind.

I an so  mad   about  those  extra  services  I was  charged  in aitport. Please, help.