I had one of the worst service experiences with Coastal Star(Kochi). They lure you in with attractive service offers, and right after the service, unexpected warning messages suddenly appear issues I had never seen in 10 years of owning my Mercedes. They immediately ask you to bring the car back and then quote inflated repair costs, effectively nullifying any savings you thought you made.
In my case, they retained my car for 6 days without resolution, offered only a partial cost for a repair that clearly arose after their service, and finally returned the vehicle unrepaired. There was no proper communication during this period extremely unprofessional and irresponsible.
My honest advice: avoid these traps. There are plenty of experienced ex-Mercedes technicians running independent workshops who offer excellent service at one-fourth the cost without unnecessary upselling to meet dealer targets.