I know exactly how feel, the first clutch I ever had changed in my E4 lasted about the same time as yours. The garage that did the work didn't want to know (b******s) so took the car to Steve Hill Motorsports and when they took the old clutch out half of it was wrecked the other half hardly used, it had just been fitted badly. Needless to say the fly wheel was shot too. I get about 15k - 20k miles out of a clutch, but do know of clutches being worn out in less than 5k miles although you do need to try drive like an absolute **** for that to happen.
Perhaps your flywheel is damaged or worn, this can kill a clutch real quick too. Was it changed with the new clutch?