I asked them to upgrade my connection to 1 Gig and it is been in progress for the past week. The call centre said it is due to a 'cable issue'. My connection remains stuck at 300 Mbps and I am unable to renew my connection as the plan change has not occured yet. Oh well, it's been working without any payment the prepaid subs expired on the 10th.
I didn't recharge airtel this month because I wasnt going to be at my apartment, yesterday I came back to apartment and as a surprise, airtel was working with 1Gbps up and down, though in airtel app, it is saying 0 Validity 0 Balance. Today is 1 complete month after recharge finished.