I reported Koh Chang immigration to 1178 for charging 100b for 90 report and wanting 2,300 for a new extension, I got a visit from one of them, they also falsely told Trat immigration that I had complained about them, totally untrue, and kept getting phone calls from them, so I had to go there and sign 'papers' to withdraw my complaint that I never made, nothing more than harassment if you complain, yes it may not be a lot of money, but its the principle, using the ferry price as a lever to pay these 'fees', ( they even pointed out that they have aircon ) but on the upside I don't have to pay their 'fee' now.