Corsa 05 Clutch Failure

My Corsa was repaired in the workshop for the Clutch system, it was changed paste and hydraulic collar. For 2 weeks it worked well now, half of the time the speeds enter well and other times not. The velocimeter does not work either and turns off when slowing down at 2nd speed. I suspect that the clutch system is incorrectly repaired. I am looking for the Manual for Corsa Sedan 2005, someone knows where to get it.