Focus shuddering clutch?

My Ford Focus is nearly two years old, it's had the clutch replaced twice and the shudder problem is still there. I've been in negotiation with Ford since early February with no joy whatsoever. The dealership has offered me an upgrade to a 2015 Kuga, but they aren't taking into consideration the two years of payments I've made so far. All they want me is to get me into a new car so that I can just start paying them from the beginning all over again. No one seems care to about my warranty, which is being disregarded. Could you give me some advice in this matter, I feel like I'm being intimidated as they're saying I have "no other option".