Airtel — 399 pack - internet not working

I m experiencing the worst internet problem! I got it recharged 399 pack on august 29th and recieved the confirmation message as — "you have got free data (Daily limit 1gb) for 84 days. This data is applicable for 4g handset with usim users only. To check your balance, dial *121#"

But the internet is tooo slow! The data consumption till date is just 1.9gb. After this limit, the internet is worst. Most of the time it doesn't work! I have a serious issue with this!

Regards
Namithaa
[protected]

I request you to resolve the issue and justify your recharge confirmation message!