If i am a manager who cashed up and fake money was taken that i was unaware of can i get sacked?

I was a manager in a large firm and monies was taken which was then cashed up under my supervision and because 2 transactions were taken that amounted to over �300 i was held responsibe, I was suspended under investigation with pay for 3 wks, and at the end was telephoned to be sacked. Is this proper procedure and what are my rights?