Are you seriously surprised that you can't keep a chicken in an apartment?
Informing the manager's son (how old is he?) is not the same as getting permission to have a chicken. The permission should have been obtained prior to getting the chicken and the permission should have been in writing. Plus probably paying a pet deposit large enough to replace every inch of carpet in the apartment, I suspect.
If the building is not being maintained to your satisfaction, give your proper written notice that you are moving and move to a better building with a better manager and better maintenance. There is no reason to live in substandard housing. You aren't chained to the radiator. Move.
Informing the manager's son (how old is he?) is not the same as getting permission to have a chicken. The permission should have been obtained prior to getting the chicken and the permission should have been in writing. Plus probably paying a pet deposit large enough to replace every inch of carpet in the apartment, I suspect.
If the building is not being maintained to your satisfaction, give your proper written notice that you are moving and move to a better building with a better manager and better maintenance. There is no reason to live in substandard housing. You aren't chained to the radiator. Move.