I also get 200 Mbps speed on 40 Mbps plan in Muzaffarpur. In September I downgraded my plan from 200 to 40 then again upgraded and then again downgraded to 40. My plan got downgraded but speed didn't. And I also get option to activate
Hotstar and
prime video in airtel thanks section. BTW aap Muzaffarpur k kis area se ho because mera avi v Lucknow server par hi hai.. and around pichhle 10 dino se daily night me 10 bje se 12 bje ka maintenance ka messege aata hai but the internet works fine.