MOVERS holding our furniture hostage! pls advice!

What should we do? We are doing a simple local move from 2bd room 11000 sqft Apleichau to same size condo in Taitam with 1 weeks storage. A mover came to estimate and he gave a quotation by email for all-inclusive (pack & unpack, move out july30 to storage, 1 wk storage, move in to new condo Aug7) all for 12k. He asked deposit $8000 cash first day he came to move, which i paid. Now he has my furniture & belongings in "his friend's storage" in Tsuenwan. He sent me message this morning that he underestimated the volume and now he cannot finish his job and I have to pay for storage and find another moving comopany to finish the job !! What consumer right have i got in Hk? Which department should I complain to? Should I go to the police?? He is avoiding calls now.. very stressful situation. pls advice. Thanks!

Hope it's not too late to help.

http://www.consumer.org.hk/website/ws_en/complaints_and_advices/how_to_complain/howtocomplain.html