I also suffer similar experience, I had vibration problem in My Altima car, took to AlTayama workshop near street no 12. He charged 6000 QR, but after I take delivery new problems started like oil leak, abnormal sound from gear box in addtion to old problem. I visited several times in the last 2 months, now he is telling he cannot do anything, and i need to take my car to someone else. Is there any way to lodge complaint about such people?