Kansas is an at will state to hire and fire but there was a conflict within the first week. Within three days of being hired I had false accusations against me that "I offended some people by comments and refused to do my job". These false accusations came from some other employees and it was a my word against your word situation.
I filed a grievance with the company because I whole heartily disagree and refute these claims. No verbal warning was given, no written warning, I wasn't given the full list of things I supposedly said, and it was only in the first 3 days of employment. Before being hired to this company I was laid off from my former employer and had no history of offensive comments nor did I ever refuse to do my job. I feel it was a misperception or miscommunication.
I would happily worked. If I was told of something I did wrong I would of happily accepted the criticism and adjusted.
Would I be able to file for unemployment from unjust termination without any prior warning nor being allowed to know and defend myself?
It may be just a matter of reopening your previous claim depending on when you were laid off from your previous job.
Additionally, it sounds like you may have been fired after you filed a grievance. Even though Kansas is an at will employment state. (They all are you know). If an employer fires someone after they make a complaint.. the employer opens their self up to being perceived as acting in a retaliatory way.