Airtel — customer care executive and unresolved issue

Address:

Kamrup Metropolitan, Assam, 781003

I have lost my phone yesterday afternoon. Incall airtel customer service today at 10am to block my sim card. An executive named pravin.
1. He denied to block my number because i couldn't give him the exact detail of my last recharge. Though the sim card owner name n address matched. And not only the last recharge but last lapu recharge he wanted. Whereas, i have told him that since long now i have been recharging online and sometimes i may take credit.. And the usual recharge amount is rs100/200. But mr. Pravin was least understanding n helpful.
2. He was very rude as i asked / tried to convince him that yes i am the rightful owner of the sim card i want to block n kindly do so, so that it can't be misused.
3. Clearly denied to block it.
4. My point is, if my name n address matched... Is it not enough? How can someone remember the last lapu recharge or any recharge for that sake, if it is not memorable or significant for some reason?
5. Why was there no alternative ways to verify if i was i... N i was not lying.
6. N why the hell will someone block some number? Wont that fraud know that the actual owner can get that same number dim later?
7. And as airtel have denied to block my sim.. If anyway my number is misused who will be responsible? And simply don't understand why can't you block it just bcz the last recharge i m unsure of? This is ridiculous!

For the first time now i have found airtel to be so unsupportive /unfriendly to the customer. While all my family members have been using airtel all the while.
If you look into this matter i will be glad!
N no customer needs to go through this almost an add on harassment because we approach the service only when we are in a tiff already. N i do have problem with mr. Pravin/anyone who does this kind of behaviour.