Real hard workers and honest

I hired this firm based on a quote given to me twice. After the case was settled, I was sent a bill over the amount I was given and they were hired based on. After they realized we jad NEVER signed any agreement, they SUED me. After clearly and repeatedly lieing under oath, I am forced to pay the amount that was NEVER discussed or agreed to in any form. How do you hire someone based off what they tell you and after it's over they SUE you for what was NEVER agreed to. DISHONEST firm!!!