Hero Motocorp — fuel lock

Address: New Delhi, Delhi

I have purchase duet dl7scc5740 june 2017. I have facing same problem every month every month fuel lock is not working. I am going service center every time no solution is service center side he is not change fuel lock employees way of talking is very rudely i say i complain you he said first you go complaint i m not prepare your job card.
Kindly resolve my problem