you should have stopped re finance the house and let the original bank with the untung house together.
then stop payin the loan.bank will tarik balik the untung house only.

OR

get as much possible of the house owners in the untung area to sue the developer using guidance from the house buyers association.see here http://www.hba.org.my/

the only option to protect your hard earned money is to find developer and sue them (of course dont do this alone unless u know a lot of Tan Sri and Dato`, but you can gather all other owners affected to make headlines and bring this case up)