Comment Be patient, keep your cool and talk to HR (Score 1) 675
Check your employee handbook if you have one. As long as you put in the minimum amount of notice necessary as listed in your handbook they should mark you as re-hireable. It may list 30 days, but one to two weeks is typical. If it's not listed, just be kind and courteous to your manager and express your concerns in writing to your HR Manager. Document everything and save everything. Make sure to send them an email thanking them for meeting with you and list the bullet points of the discussion, along with requesting delivered and read receipts.
They should play ball. If not, you might have a case. I'd recommend checking with an employment law lawyer in your state. Keep in mind you'll probably have to pay for the consultation. Unlike class action attorneys on my site (http://www.TopClassActions.com) they don't work on contingency.