Airtel — airtel high voltage bill shock

Website:

airtel.in

Roam world freely is the advertisement which is very misleading and after looking at their advertisement, I thought airtel is the best service provider and most trusted network, however this is not true at all, recently I made a business trip to Maldives and my IR pack was activated but to my surprise after I landed and try to use the network but it wasn't activated on that day. No network continued for 2 days and all of a sudden without any prior notification, I got an sms on the 3rd day of my trip stating that the unbilled amt is 55K and before I could remove the sim, I got another sms that the unbilled amount is 1.16l and this sudden un-notified activation happened @ 1 am early morning. I feel that airtel is cheating us by not barring the service as soon as the credit limit is crossed.