Gear box taking 10 months to fix

During the last 5 years, I took used to take my car to my dealer in Jeep Midrand (Grand Central), this is the same place I bought my car, because it was having breakdowns due to gearbox faulty or so. Every time I took it in, they will bring it back and say it was fixed, there was a problem with the software which they said at the time they have fixed it and I can take the car. This happened for several times in this 5 years and the car was still in warrant at the time. Then in January 2019 the problem became severe, then Jeep SA approved that I take my car in to the dealer to be fixed. Now at the dealer I always get the response, ever since January 2019, that either the gearbox that they always receive from Ital is wrong model or the software does not update correctly it gives errors. I am not happy at all with the service that I am receiving at the moment, I am extremely dissatisfied, it is now 10 months later I still don't have my car back and I am not getting the joy. Just for Jeep to fix the gear box it is taking 10 months. Please help with my complaint, I need assistance.