Maybe try an actual dealership if no one can figure out why your brake pedal goes to the floor and you can't stop the vehicle. It's not rocket science. I question the competence of the shops you are using.
You have two choices: Install the bigger brakes as was suggested to you, (which probably won't fix the issue of the brake pedal going to the floor) or, sell it before you injure yourself or someone else by driving a vehicle with no brakes.
You have a master cylinder or brake booster issue if there are no brake fluid leaks and the pedal still goes to the floor.
Edit: There is absolutely no reason to resort to throwing insults at the people trying to help you. Familiarize yourself with the forum rules before you get yourself banned.