Break Disks

I own a new Clio. I have replaced the break pads and disks 2 times now. I only have 50 000 km on the clock. Putting aside i had to replace them twice I now am experiencing breaking shutter on the breaks. I took in the car again and now the dealership said i have to replace it AGAIN as the break disks have a wobble in it again. This is really bad especially for a new disks not even 6000 km in. I dont want to replace this every ****** 12000 km. I need answers!