I don't know exactly how it is in HK, but in the UK, you would have likely had to sign some kind of agreement at the outset of the relationship. Did you sign it? What did it say? And they would have checked yout passport ("know your client"), references, etc. Did they follow the correct procedures?
The way you put it, this does sound OTT. If that's the case, the firm is probably just not "tuned in" to your frequency. One way to get their attention is to lodge a complaint: The Law Society of Hong Kong
They won't likely ignore that...