1-2 months back I received 50 GB free as top up from Airtel on my 30 GB 16 mbps plan probably because all existing plans were upgraded. Few days ago I saw the Airtel surprises Ad on the airtel website and gave it a try and got 50 free GBs again. But that wasn't provisioned on my account. Anybody knows why? Should I call Airtel and ask them about it?