Maruti Suzuki India — wagon r producing noise

Address:

NH 33, PARDIH, JAMSHEDPUR, East Singhbhum, Jharkhand, 831005

I had purchased my wagonr car jh05cb 9378 from motor world jamshedpur on 24/04/2018. On 23/04/2019 they had taken it for last free servicing and returned it in the evening but to my surprise they did not wash the car. I had complained it when they had called me for feedback who assured that it will be done but i am still waiting for it. Recently i have detected a sound produced while driving which increases with acceleration and reduces when the acceleration is reduced or the brakes are applied this i complained to mr. Alam service manager of motor world who sent his person on 25/06/2019with whom i drove the car and he also heard the noise. He took the car to the service station and returned me in the evening but the sound is still there. Since then i have spoken to mr alam to take the car and remove the sound but he is making excuses. Today when i spoke to him he told me to take the car to the service station but i told him to pick it up since i do not have time. He finally told me that he would pick the car on 29/06/2019 and make it like any other car sine i insisted upon him to remove the sound.
I therefore request you to make sure that the car is taken urgently and the sound is removed or else replace my car with a new one.