I know there might have been some instances where the folks there might not have been able to address your concerns. I feel this is not the right channel to express your stress. If I would have been at your place then I would have talked to them directly and asked reasons for their decision.
Inspite of that if they are not replying then I would have let them be. Never go back again and enjoy your life! The world will not end if you are ill-treated by someone. Just look for another opportunity and make yourself capable to grow in life without the support of others.
People will recognize your work. All the best and forget any bad experiences of the past.
God bless you!