Today I had a service from there as I did every 3 months.
Before I got the service, there was no problem with my doors. I am sure because I opened it to put my stuff at the rear seat.

But after the service, when I opened the door, I heard some sound. So I asked the technician to check it. But he jut put lube oil.
And then the sound had gone.

So I complained if they performed it in the service. Obviously, he said 'yes'. So I complained it to Service Manager. But he was much more arrogant. I explained the situation. But he said because for now the sound had gone it was ok.
But he did not apology for the poor service. Just said "I have no idea" and went away to his office.

I am very upset. How can I report their bad service and attitude to customer.?
Please don't go there for service.