Schools range from completely reliable to crooks who leave foreigners stranded without a legitimate work visa after they arrive. It is illegal to work with a tourist visa, but some schools want teachers to do that, and some even want you to foot the bill for “visa runs” to Hong Kong to renew it, although with restrictions on renewals this has become more difficult. Be sure to speak with current or former teachers from the school before you sign up. If the school won’t put you in touch with them, or if current teachers don’t have Foreign Experts Certificates, don’t go near the place. In fact at present, it is not possible to obtain a work Z visa in Hong Kong unless the invitation paperwork clearly stipulates it. This is also true of other nearby countries such as Hotels In Vietnam, Korea, Japan or Singapore. A final note of caution valid for all disputes: do not show anger. At best you get a concession but you will pay for it later on down the line; but more likely, your anger will simply terminate all contact on the spot and you will be ignored. If you feel anger welling up, politely break off the conversation, say goodbye and come back after you have cooled off.