Airtel — no network for calling as well as no faster 4g internet connectivity

I'm not able to call any other numbers because of poor network connection that too during night times the network is not working properly, i will switch off and then on the phone then only i can make calls. Then very poor 4g internet service very slow loading and can't connect to any website or bank apps in any emergency situations. Please solve this network problem immediately or else i don't have any option other than changing your network.