Toyota Corolla Advanced 1.6 MMT

I find it unnaceptable that Toyota had manufactured a vehicle that it refuses to buy back at its dealerships. All I hear is that the MMT gearbox is very troublesome. After spending R30000 at one your Durban dealerships to repair this gearbox i still cannot trade in my vehicle. I have been a loyal client of Toyota from 2004 when I purchased my first vehicle. I use Toyota to service my vehicle . I feel ********** that your own car, the Toyota Corolla 1.6 Advanced MMT, that you made cannot be traded in.