I work for a major company here in North Carolina. I have been keeping a file for the past 3 years of stuff that has gone on within my department. The majority of stuff is contained with employees that harass and get away with it on a consistent basis. It has been reported to a person in charge who never once acknowledged the incident. I saw this person right after it and he never once mentioned he would help me with it. I have since made it known that I will be leaving the company next year and was told by the boss that I would be working my off from here on out. I have kept copies of the schedule and note that I am working a considerable amount more than the others. Put it this way, it is very obvious on paper.
The events go back to co -workers breaking in to my hotel room and causing destruction of property. This was never dealt with. Always swept under the rug. Does anyone think that I have a case here?

If you have all this documented, yes. If you can prove all this with dates and times and incidents and dialogue, I would believe you have a reasonable case. Have you talked to your Human Resource person in the company? What is the company policy against harassment? You can lodge your complaint with Human Resources but make duplicates of everything you give anyone. Journal all this. You need to be as explicit as possible and as careful as possible.

If you do not get anywhere with your Human Resource Department, will you consider going over their heads and perhaps even outside the company to lodge your complaint? An agency such as the Equal Employment Opportunity Commission? See their website:
U.S. Equal Employment Opportunity Commission (EEOC)

Whatever you do, do it legally, so they cannot come back and charge you with anything. If one picks a fight, one needs to have clean hands (an old proverb given to me by my first employer). That being said, I do wish you the very best in this. I have been done that road with an employer and it was not fun but worth the fight.

I will say it depends, on why they harrass. If they don't like you because you are keeping notes on them ? Or because you have red hair maybe, or they just don't like you persoanl. One employee can be mean to another one and not really break the law unless it is done because of a protected class, harassed because of sex, religion, race and so on.

Making you work harder because you are leaving that company in a year also may not really be illegal, poor management but perhaps not illegal