[Resolved]  Airtel — not getting benefits of 349 in my phone

I have recharged with 349 on 3rd november via phone pay. I called that night to customer care but didn't get any positive response from them. Then after i rate the "my airtel app" on play store and got a mail after 3 days. Now almost the expiry of the pack is near and still not get benefits. The problem is i recharged but unable to use in my phone but usable in other phones easily. I thought may be the the problem would be with the sim. I have replaced the sim as well. Then again problem was going on i called my phone service center i. E. Lenovo k8 note. They said that from his side everything is fine. Now i am not able to understand where is the issue. I already told to airtel please refund my money but they denied. Help me if possible.