I went to USA, and from there through Online, I got the International roaming pack activated assuming that after 10 days it will automatically expire. but it was extended for term term of 10 days, while I was there in USA for 12 days. Read between the lines, while subscribing to Airtel International roaming pack. In case you subscribe for 10 days, and happens to be out of country for more than 10 days, instead of blocking the facility they will extend the facility at full cost, without your permission.
I have suffered a loss of few thousands on that. I requested them to at best charge on pr rata basis, but with no results. I requested for talk to senior person, for which I was told that a call back will be arranged soon. Yet awaiting.