Wrongfully accused of theft, what can i do?

I was recently let go from a vending company for tardiness. I hadnt gotten paid from the boss for a few weeks. I tried to get my pay after i left and was ignored. I kept trying for it. He finally told me i had to “wait because the ATM compay is doing an investigation for theft”. I told him i never stole from him and i need my pay. He basically said if i try to collect my pay he is going to press charges for theft. I told him again i never stole from him. He said they caught me in a “sting” and that they caught me “red handed”.
He refuses to tell me what evidence he has, I never stole from him. There are 4 people that have the combination to the safe on the ATM. I easily could have been framed for theft. How can i prove im innocent?