Seems to have been broken for months now. Never had any problems with other cars yet this one never gets fixed?
Broken how? Sound? Not shifting? Shifting slowly? Shifting quickly? Simply saying broken doesn't help. Try to be more specific with what the problem is and maybe you can get some assistance with it.
Try using the car with automatic transmission on Novice or Amateur difficulty (haven't tried Get Real). The car will jump out of gear and randomly downshift.