Mijin Construction is pathetic - sub standard work throughout

I regret fully the day i purchased a house from Mijin construction.Everything is falling apart. The roof in the garage and the patio is leaking and it is about to fall off. The bathtub cracked, kitchen and walldrope cupboards falling apart,plugs --electricity plus falling off posing a hazard to small kids, the plumbing is a mess, you flush a toilet, the whole house shakes.We have complained to KIm, the manager, but no help.It is over a year now living a nightmare in a house bought brand new