no you have NOT responsed to all your mainland chinese customers I know of 20+ that I've personally spoken to who get no response from you regard tech support, sales support or even billing support. I would suggest you actually respond to email from chinese customers faster. I have suggested that several of the EXPAT FORUMS remove your advertising from their banner masts, and that will happen this week. you DONT deserve to take our money and just ignore us completely.
A VERY UNHAPPY CUSTOMER.