Repeated clutch failure?

I have a ford transit 2003, fwd, 2.0, tdi. Repeat clutch failure I had the gearbox supposingly reconditioned since then Ive had 2 clutches fitted in 3 months as th gearbox seems to be stripping out the spindles of the clutch plate. Has anybody had this problem and any tips to help me get to the bottom of the problem? Please let me know.