If you can't understand that it has nothing to do with the 200 baht, then I can't help you.
Try this then - they charged 10,000 baht - does it make a difference to you now? 😞 Can you understand the fuss?
Thai immigration get a salary just like me and I make do. I don't charge ' clients' xtra money for services that are free because I am not corrupt. If they want to make more money then don't join the police. It's simple.