Previous experience with a suspension problem on a Fiesta (which admittedly would have cost ford significantly less at about £500/car to fix) suggests that if enough of us complain it might get ford CRC to do something about it, but we had about 20 people with Fiesta's last time, and I don't know how many people are still suffering from the gearbox issue.
So how many of us are there, who's still got the car and still having problems?
My sympathies. Having owned a C-Max CVT Auto and had the poor running problems you've had I've trawled all the motiring Forums and found a dozen or more examples of people with the same problems - none of which had found a solution. I sold my car after 15 failed attempts at a repair.
I also found lots of examples of gearbox failure - most of which are at far lower mileages than yours. All had had the same response from Ford -£4,500 plus for a new gearbox, no contribution.
Some people have had their gearbox repaired by an auto gearbox specialist for about £2k, but repeat problems seem common.
In my view Ford have taken the attitude that they won't give any support for this model - probably because there are so few cars out there.
My advice - do what I did. Get rid and never buy a Ford again- even if it costs you thousands .