2008 Ford Focus drivetrain & axles problems

I own a 2008 ford focus. In 2010 my car would jerk badly when I would press on the brakes. I took it in to ford and they said the problem was my transmission. Luckily I still had warranty and they gave me a new one. When I got my car back from the repair shop I still noticed some jerkiness to it and told them. I was told to keep driving it and it would go away, it never did. 6 mo.later I notice the car getting worse. The gas pedal is hesitant and the gears hesitate to shift.

I have an 08 ford focus s that has just under 80,000 miles and the car is horrendous recently it won't accelerate in low gear. You can put the pedal down but the engine rpms go up but won't accelerate until you slightly let the pedal go and it will jolt forward and engage the transmission. This isn't the first case from what im hearing and wanted to file a complaint on fords transmissions being faulty and or defective.