Airtel — no help and support in debugging high usage issue

I have been using airtel broadband at my home. A few months back there was a high upload of data from my account. I was perplexed how it happened.

My router must have been under attack over wan port. I asked for help from airtel. However they just said they are working on it but provided no information to me that could have enabled me to isolate the issue.

I even wrote to the ceo but there was no response.

This is a classic problem of service providers. They have no customer centricity and are not willing to go that extra mile.