Had a worst experience with them during the 10 day north east trip. They are fraud. Their top reviews are all written by the owner and his relatives. His name is Ashish alias Virat. Website: https://sevensisterstourism.com/
They did not book the hotel properly and drivers initially were pathetic. Then luckily we got a driver named Ripun, who saved us during the trip. Otherwise we would have got stuck on the road for sure.
If you are planning North East, I can guide you so that you dont fall in such kind of trip.