Service is worst bcz ive given my cpu for repairin...

Service is worst bcz ive given my cpu for repairing and they charged me 1000 for that and they said the problem is with motherboard and after repairing.. i faced same problem... Soo i gave it to another repair shop the problem was with processor fan and its hardly for 300 rs... So i dnt knw what dcc ppl repaird in cpu and on what basis they charged 1000