It is very simple TIT. Especially as Thai you should know it. And yes you are living in an extremely corrupt environment. As you know civil servants are so underpaid here that they have to make a correct living utilising their power, for example signing the paper giving the certificate or not....I also don't understand why you are involving a third party in your problem. So stop your Calimero, pay the amount that is an alms for the farang and happy marriage.