KTM Sportmotorcycle — rpm stuck at 3000 for much time

Address:

122001

Purchased ktm 390 in dec 2017.in july 2018 bike rpm started staying at 3000 rpm for much time. When rpm is raised and released to let it fall to 2000 (Idle rpm), the rpm stays at 3000 for sometime and then lowers down. The problem is while gear down shifting, have to wait more till rpm drops to idling and then apply gear. Otherise gear shifting acute noise is heard. Been to ktm gurgaon sohna road service center, guys unable to do any good. They told me, we suggest not to open race related things and will ask for ktm india rnd centre. Still after 1 month, no response to this technical issue.
[protected]
Parteep,
Gurgaon, 122001 india