I was accused of theft at work and I'm denied my final paycheck, what can I do?

I was an employee in the transportation industry. A few weeks ago my former employer fired me via a voicemail left on my cell phone while I was asleep on my night off because I would not answer the phone to come in for a call in shift. The employer has since accused me of stealing company property at a time when I can prove I was out of town. They are also refusing to pay me the wages owed in my final paycheck. What can I do?