Poor service

We bought a toyota legend last year with a rolling shutter at godrich toyota Yesterday we took our bakkie for its 50 000 km service. And asked for wheel balancing ect. We live on a farm with a 20 km dirt road. They did the balacing ect with the dirty wheels. Now it still bounce well driving. The bakkie itself was still dirty inside and outside with pieces of mud still on the wheels. Our rolling shutter also keep on breaking. 3rd time now. Now they say we put something heavy on the rolling shutter. That is not true. So they refuse to fix the rolling shutter