Not enough experience

I was told today that I was not short-listed for the plantilla position that I am currently working on as a COS. I was so sad that I can't help but think about it. They said I didn't reach the 2 years relevant experience because they did not count my accounting teaching experience for the accountant position. Why hire me in the first place then later drop me when all I didwall the job flawlessly? This NGA is si unfair.