House Zero disappointment

I will definitely not recommend House Zero! They are currently erecting a House Zero for us. Their first completion date was after the 8 weeks (56 days) promised...we are now at 115 days, and fourth completion date given will be after 176 days...this after paying 80% of contract price...delays, empty promises, unanswered emails and Whattsapps, deliveries in drips and drabs and lots of tears and frustration. Not sure if they are capable of finishing our house...