Exact same experience for me too. After the policy of changing plan only on the billing cycle came into place, it basically never works. The CC guys raise a request to the backend team to do it on the billing cycle change date and everyone forgets about it. If by chance the customer remembers to check if plan has changed, only then does he come to know about it.Last time Airtel presence helped me get the plan changed and I have applied for another upgrade from the next billing cycle (starts on 5th). the request was raised on 24th itself. Lets see if it actually gets changed on the promised date.