2002 Volkswagen Jetta Slave Cylinder

Good day there,

When my car reached 90000km, about 3 weeks, we had to change the clutch system, so we did a clutch overhaul, including changing the slave and the Master cylinders. After changing all that, the slave cylinder started leaking within the first 1500km, replaced it again, and another 1000km later, the slave cylinder is leaking again. I noticed that the after the clutch overhaul, the clutch was too soft, without that strong usual feeling you have and the mechanic assured me that it will be well after a few days, but it never changed, it has costed me three brandnew slave cylinders. My vehicle is Jetta 4, and has a cable clutch