When I was extending my son's visa, I used to prepare the documents such as photo copy of his Passport with visa page, his HK ID, his Birth Certificate and the Visa extension form (original) and lastly my and my husband's HK ID and our marriage contract, To make it short, whatever is related to my son's application, I made it sure it was photo copied. I submitted it to mail, be it by post or by 2/f Immigration mail box 1 month before my son's visa expiration, addressed to Visa extension section. After 1 week or 2 they sent me notification by post that they are processing my son's visa. Then after 1 week they sent me again a mail confirming my son's visa approval. It usually took 3 wks. The letter stated the date I should present the original documents I've submitted, including my son's original passport in person, after 30 mins to 1 hour, they sticked the visa on my son's passport. 10 days is not really enough for them to process it. The lesson learned here is don't listen to others if they tell you not to copy your documents. Heresay should get you into trouble. I always read the notes in the form and their website rules and regulations when it comes to immigration papers processing. I don't rely to other people. They will just confuse you and give suggestions but they don't really have the basis. Probably, the rude immigration officer thought of you impliedly that you are above 18 already, and thought you should have known it by reading their notes on the forms. That officer was just impatient and don't know how to explain it further and in a civil or diplomatic way. They lack proper training, they were just hired but they were not properly trained.More years of experience with his job will teach him how to handle his position well. But they should be reprimanded. I guess writing a formal complain is not a bad thing to do. I also do it especially to bus drivers with rude attitude. So they will be notififed and reprimanded.Just simply email the immigration complains section and they will reply to you that they will do actions re it.