Honda Cars India Ltd. — honda new amaze vx I-vtec reverse gear problem

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I have purchased "honda new amaze vx i - vtech" model car on 06.09.2018 from the dealer tvs sundaram honda, erode district, tamil nadu. On driving, while changing for reverse gear, i have noticed a sound from the engine area. The same was also complaint during my first service. They told that gear arc and beam relating to reverse gear has to be changed and it's a manufacturing default.. But i regret to inform you that changing gear parts within 2 months of purchasing a new car that too from honda is totally not acceptable.. Even though it could be rectifyable, changing parts in a new car is highly makes me unhappy.. Is the spare part is worthy as in original? How long it will be good? How can i trust its quality? Original itself damaged within a month period, then how can i trust ur spare part? We need your reply.