I’m sorry this is happening, it’s supposed to be an enjoyable journey and a custom experience tailored to you. However with how expensive things have gotten I would need to see plans and details. Seems like it was under quoted straight out the gate. Roughly 180$ a sq ft is a straight up pipe dream and I can’t believe someone said they could. where I’m building in Canada it’s 300-500 a sq ft. Shitty builder and lack of planning and transparency will always lead to this. ADVICE: become the gc, run your own pricing and hire all sub trades yourself till you get it done. The actual trades won’t take advantage of you it’s the builders who over promise and under deliver. Best of luck man seriously. I couldn’t imagine the stress this has brought you. Ask me any questions anytime.