My Name is Deryck Rodrigues (Mobile: [protected]). I am very disappointed with the service provided my Maruti Authorized Service Center (Spectra Motors, Ghatkopar (West), Mumbai). My vehicle is Maruti Alto CNG Reg. NO. MH 03 BE 8092. During my last service I had informed the advisor that my engine is vibrating while working on petrol. The engineer charged me Rs 1000 apart from the other charges and give me feedback that the petrol fuel jet was jammed and has been cleaned. However even after that the problem persists. I immediately called customer relationship manager and reported the issue which continued even after Spectra advisor said the problem is resolved. During the recent paid service, I informed the service advisor Mr. Abhilash the same problem of vehicle engine vibrating when I am running the vehicle in petrol BUT do not have any issue when running it on CNG. The advisor this time charged me additional Rs. 350 for tap-head settings and said that the problem was with Taphead and it will not be resolved. Even after that the problem persists. I informed my dissatisfaction to Mr. Kishore (The Works Manager), however he did not agree to my complain and said that this is common for all Alto CNG vehicles as they have 3 cylinders. I was further informed by Mr. Kishore that he will come back to me after he checks the similar issue with some other Alto CNG vehicle. I have not been committed of any resolution and there has been push back answers coming from Spectra Motors Works manager. Till date I am not able to get satisfied answer to my issue and the problem persists. I am very DISSAPOINTED with the type of response given by the Maruti Authorized service center like Spectra. Kindly look into the issue faced and let me know the next course of action.