Hyundai Motor India — Engine check light problem in i10 nios cng

Address:

1/680 uit, bhiwadi, dist. Alwar ,raj.

I had bought i10 nios cng magna on june 28...1 month after, engine check light is showing..i had gone to several hyundai service station..many times...they dont know anything...mechanics are not good ...on petrol mode, the car is having missing problem..and there is also problem on petrol to cng switching on cold start...
I had gone to jmv hyundai bhiwadi and rama hyundai new delhi...these two serce stations have worst mechanics...i am extremely unhappy and unsatisfied ...plz help for solving the issue of my car