problems with new chvy optra wagon

I have a four month old Chevy Optra Wagon with about 4000km on it that has been in the shop twice already. The computer system went nuts and nearly got
me killed in an intersection, and, the transmission chugs. Is there anyone having similar problems? GM is trying to tell me that they will be able to fix it in two months time.....for now, they have uploaded new software to deal with the first problem, but they do not have a fix yet for the transmission problem. Apparently if I had leased the stick shft, I would not be having any of these problems. Further, on a full tank, I only get 380 - 400 km! My Tracker had far better milage than that! I am annoyed that the dealer and GM have wiped their hands of this car and tell me that I am stuck with it for the duration of the lease. Any help out there?
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