Honda Cars India Ltd. — pathetic service experience with pinnacle honda kolkata

I bought honda wrv idtec from pinnacle honda kolkata. First of all they ensured to provide gold coin but later on they just denied.

Now comes the pathetic service experience with them...
From the very first service i am telling them, i have a problem with the left suspension. Some noise is there. They told me it's repaired.
As i stay in bangalore, my parents use that car. They can't drive, so driver is there for their convenience. I usually come to kolkata once in a year. When i came i checked the same noise. Again i knocked them, again same treatment for 2nd service... Again i checked while i was in town, it's the same thing... Third time, again the same story... I wrote down to honda... Then they called me and told sir, pls don't write anything to honda, we wl work on your problem... Again they took the car from home and i am not sure what they have done... I came back in town now, and i am experiencing the same noice... Can you please help me out on this?? I am a big fan of honda... I have a honda city in bangalore... But it's not possible for me to keep track of this every single time as i don't stay in kolkata... Moreover, once a service guy told me diesel cars have this sort of noise... It's normal... Are these guys eligible to service honda cars... I always prefer diesel cars... I challenged him, that i can show you my other diesel cars, those are not at all sounding like this... After that incident that guy never called me