My 2014 Audi A6 goes through front rotors and pads in 20-25k miles. The dealer replaced the fronts three times in 70K miles while the rears are still good. The front rotors have warped 2 of the 3 times.
Considering that you told us nothing about your driving style or conditions, service was done at the Audi dealer and the fact that these cars have very robust brakes…
The only conclusion I can draw is the problem is with you as the driver. Either where you drive, or how you drive but probably both. Tell us more detail and maybe that conclusion will change.