Dear Frustrated Gryffindor,
Simply not answering your questions does not make a teacher lazy. Perhaps they have instructed you to find the answer in your textbook. Many teachers point students towards the answer in the hope that they will make the efforts to truly find it.
Do not simply tell your professor that you don't know the answer. Show them how you have tried to find it. Anyone can say "I don't know".
Only after you have exhausted every means of communication should you attempt to go their superiors, but be prepared. Merely saying you've been treated unfairly isn't enough. Not even if you are the chosen one.