Airtel — recharge benefit provided wrongly.

I did recharge of 198 pack on 10 dec 2017 which gives 1gb/day for 28 days. I came to know about the offer on my airtel app account. After recharge i got only 2.6 gb per 28 days. I was shocked and called to cc, the person spoke that informed that offer is available and will be activated within 4 hours, still i have not get the offer. I called cc again but no response from them. I spoke to two supervisors, no one helped me and not showed interest to raise a complaint. Supervisor farvez spoke very rudely and without respect. He did show any interest to listen to me. Need immediate assistance on this.