Unreliable service centre

I took my car for service on the 30th of May 2023 it had some funny sound after diagnosis they told what was wrong and give a quote for repair and after repairs they come up with another problem when i was supposed to go fetch the vehicle and they fixed it and again there was another problem, which now makes me wonder if they are indeed a reputable service centre , how could they not find the problems at once now it is taking me two weeks to have my car sorted out and the price of fixing has escalated exponentially i am afraid it will keep on rising before it is fixed