Bajaj Freedom 125 Cng Bike Update

So it stopped working on cng don't know why, we gave it to nearest service center but they couldn't solve anything as they weren't trained, so when i shift to cng it just doesn't work and when i shift to petrol it runs smoothly, i can run it on cng only when i am at 60kmph+ speeds and i have to accelerate constantly to start it and then it starts working but when i slow down it looses its power. So now i have given it to main service center in the city they said they will call me i will update you guys