2011 Ford Territory recall hasn't worked

I have a 2011 Ford Territory RWD TS diesel 6-speed automatic.

In February 2017 I received a recall letter from Ford – Campaign No 16S19 – stating that an intermittent Output Speed Sensor failure may result in an unintended downshift into first gear. At the time I was experiencing this at low speeds as described in the letter. The car was taken to a Ford dealer to address the problem. After this I was still experiencing the problem and returned it to Ford where they could not find a fault code and the car road tested ok for them. But I was still experiencing the problem after this and it became a lot worse in December 2017. I returned the car to a Ford dealer but again no fault codes were logged. They believed it had nothing to do with the recall, but did admit the car has a downshifting problem at low speed.

Do you believe I have a case for some assistance from Ford?