poor workmanship on Mercedes Benz cars.tearing leather ,rubbers etc

I have bought a Mercedes Benz in 2016 at Mercedes polokwane.Three days after the rubbers from the door went out.They were fixed but that showed poor quality in the accessories for the car.recently the driver seat leather was torn out.I took it to Mercedes they approved for the cushion,but it is not the only place where there are damaged.When I spoke to the consultant I was told it cannot be fixed.The rubbers of the front door is also getting out.I mntold it is no longer covered.this means that I will keep on repairing the car forever.I have a toyota yaris which I bought in 2008.toll today the seats are intact.so I must always be in and out of Mercedes repairing my car.noe I have to pay 3900.then I must pay onother one for the upper damage on the seat.mercedez s a big brand I don't expect this from this company.i don't enjoy the car at all.if it is not tearing seats,it is rubbers .I don't know what will be the next problem