Hyundai Motor India — very poor quality of speaker sound and my dealer has poorly done anti rust to my car

Address:

Muzaffarpur, Bihar, 842001

Hello sir/mam
I bought your hyundai grand i10 sportz car on 9th august 2017 and i found that its back speaker is not good and on 28august i took my car for anti rust to the car dealer (Balaji hyundai muzaffarpur bihar) it has done very poor anti rust coating. On 10th of september i washed my car then i saw that the anti rust layer is starting falling down. Kindly look into the matter/complaint.

Thanku