New Smart Brake Problems

Hello all, I’m stunned and hope someone can help me. I picked up a new Smart in Sindelfingen 12 weeks ago. I had the known braking problems with this vehicle. Everything helped nothing, after a long fight I could return the car. The bad thing was that Smart set the tolerances so high that it suddenly said nothing could be done. The Smart would now be in tolerance …… So,now I picked up my new Smart 3 days ago. I could vomit,he is Just as fucked up. Although he no longer pulls to the right or left, the vehicle is so restless when braking I could really vomit. Then I am back to the dealer with 30km on the speedometer. He meant that the braking behavior on this vehicle is more than bad. That would have everyone……. My question is this really so? What can I do?