Refund wanted on Fiesta

After having the dealer "repair" the "faulty" double-clutch in my Ford Focus twice, I was informed that it would probably need to keep being repaired and that they were offering a better than average trade-in price on this car. I want my money back! It seems to me that the dual-clutch transmission shudder fault was inherent in the car when I bought it and I was ignorant of it, and I should get a full refund. Is this feasible?