<prompt> Translate the following text to EnglishKwa nini kutoa punguzo kulingana na kuepuka gharama aliahidi katika kiwango cha awali au kesi ya uainishaji lakini ambayo akiba walikuwa kamwe kukamatwa na Huduma ya Posta?  <response>: Why not give discounts based on cost avoidances promised in a previous rate or classification case but which savings were never captured by the Postal Service? 