Royal Enfield — Idling Problem

There is an Idling problem Issue In my bike Since 3months I have Visited the Service center 4 times but still, the problem has not been solved last time when I have Visited the service center they have promised me that the idling problem will not come again and they have told me to take for a long drive so the new replaced part will be adjusted but there is no use I have Raiden almost 600km but the problem is still not solved Please kindly solve the problem I am not able to raid the bike properly when is used to slow down the bike it will get turned off and when I use to turn on the more loud chain sound will come please kindly do the need full I have purchased the bike on 23/4/2021 only 9months old these many problems are coming so please kindly do the needful or else take my bike back and return My money