First time I tried to go back later on in the day and the cambodians said it's very unlikely they'll let me back in so they won't stamp me out. The day after they tried charging me. I just said no. They took me aside and made me sit in a small room outside of an office. Then of course they come again saying I need to pay. Just kept saying no and eventually they just let me go. I just took a taxi to Siem Reap airport and flew back in.