Airtel — internet always works in 2g even if I have 4g pack

Address:	577004
Website:	Airtel

I have an airtel active 4g internet pack and mi 4 which is a 4g handset. I always get only 2g internet speed. When i called the airtel customer care, they always say that their networking team is working on the issue and they will. Resolve it soon. But nothing is happening. My money is getting ruined in the name of internet and providing such a worst service. I am fed up of the service from airtel. Kindly take strict action against airtel.