Royal Enfield — On 4 service , chain set got damaged

Address:	110095
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Good afternoon, I am Durgesh Gupta, my vehicle no is Dl2SP 4905, on 28-12-16 I did my 4 free service, from yesterday a knocking problem is produced from chain set and bike takes jerk during driving . The manager tell us that there is a maintenance problem from u, that's why this problem going to occur, but I did my service always continuously at right time, now he told that this part will changed on warranty, so kindly solve my problem and take further action