Airtel Kerala Prepaid
Lifelong validity not implemented after payment

My subscriber number is 9995567445.

I received an SMS from Airtel that there was an offer for getting lifetime validity on payment of Rs50 and SMSing 750 with the words YES. I did that. There was a response that it would be implemented within 48 hours. Instead of providing lifelong validity, my validity was extended by approximately one and a half years! This is a scam.