Airtel — prepaid recharge service

I am very disappointed by airtel prepaid service i have recharged on my prepaid airtel number [protected] on date 31/5/2017 of 149/-. I had a offer at *121*1# saying that a2a free calls and 28 gb 3g/4g data for 28 days @149 rs.in that offer it is also mentioned clearly that if you recharge today then you will get the same offer for 12 months. I've used that offer for 3 successive months but somehow after 3 months that offer has disappeared. I called to the customer care but they didn't solved my problem. I hope you will solve my problem. Else i am going to port my airtel number to another service provider.