Airtel — data not working for 399 plan

Dear sir,
My mobile number is [protected] and i recharged 399 on august 12th but after some days 1gb per day offer not working in my phone money deducted when i browse data. Please resolve this issue. Airtel promised to give 1gbdata per day for 84 days. For more than 15days iam unable to use data. When i contact customer care they said to reset my 4g settings and restart the phone. Even then my problem didn't resolve. I went to airtel service centre to resolve my issue they said to switch to another 4g sim and gave new 4g sim. I did that too. But swapping didn't solve my issue. Iam vexed with all this and complaining you all this to offer good service with following minimum ethics and don't bother the customers with this cheap practices. They are loyal to you only because of your services. Don't make us disloyal to you. Please resolve the issue.