We purchased our JVC 46 inch tv from Fortress. After having JVC install it in July, mounting it to the wall for us, after about 2 weeks the cathode wouldn't energise.
I phoned up JVC customer service in TST, and the girl booked in an on site service call, which took place 2 days later. The part they replaced didn't make any difference, the service man hinted that it might be best to just have the TV replaced with another new one. They came back a week later with a new one, and the sales manager attended to make sure we were happy. WOW I was blown away . The replacement has been great ever since, so, happy lil Vegemites we are.
Fortress have very little say, or much responsibility, better that they are not involved, and to just deal directly with the company that is legally responsible for the product warranty. Getting angry with the service dept also is a bad idea, unless you want your warranty claim dragged out. I have always been nice/polite to the service people when we have needed it, and things were always sorted out in an above satisfactory time frame.
Hong Kong being the tiny geographic location that it is, it might be worth considering a visit to the distributor/service agent of Toshiba HK, lodge your receipt, with the carton barcode/serial number
stapled to that and pay them a visit in person. they will issue you a claim/reference number and a direct number to call the person handling your warranty claim, and all should be peachy from there on.