Acceleration Issue in my scooter (Torque is not picking immediately)

Acceleration Issue in my scooter (Torque is not picking immediately) while in signals/slow moving traffic/speed breaks lot of issue). It's not even moving forward till I raise accelerator to 90 Degrees. I showed in service center, they are not able to find manufacturing defect. When I did a test ride in another scooter, it's in good condition.

Best Features: Scooter looks very nice

Pros: Look is good

Cons: Mileage not as per company standards