My Macbook Pro was having issues (the display was ...

My Macbook Pro was having issues (the display was switching off), went to Conquer Technologies, Ameerpet, the Authorised Service for Apple.
They took it for service and returned saying that they cleaned the machine and is working perfectly. The problem happened again. I went back, they refused to check it again without paying the service charges again. I did not want to pay the charges again for the same problem, and went to another center. They opened the machine in front of me and I found that they didn't even clean it! This is the level of service of authorised Apple service center.