Make Free CAll Because Airtel Servers are down

Yesterday, i became just having fun with computer, received SMS from of my good friend who never send me SMS before (he was bit money saver). I became in shock that they sent me SMS !! . but soon i stumbled on understand that Airtel Servers are down. and cash just isn't deducted from Balance. (Even it had not been showing the balance)
Airtel , one of the biggest GSM company in India was down that day. Actually whole airtel was not down but there money server was down. All calls and SMSs were free (These are still free while writing this blogpost). Many guys enjoyed Free calls, Free SMS on that day. (but still enjoying). Even SIM Cards with Zero balance were also able to make calls (Free calls).Last time about A couple of months ago Airtel Servers were down and ditto was happened (No deduction of balance).
I received a SMS from Airtel yesterday evening it turned out such as this
Priya Grahak, techinical Kharabi ke karan aapke Mobile screen par Balance dikh nahi raha hai. Kuch hi der me aapko baaki sahi balance dikhne lagega.
Its in HINDI Language (India).
Therefore i think Airtel will charge all money once they obtain the problem solved, (however i dont want to buy).
Many guys misused this chance (even me too) by looking into making long STD calls and thousand SMS were sent during this day (by a single person).
This problem could possibly be related to Fire at Peninsula Chambers, Lower Parel, Mumbai, which then causes the electricity failure at Airtel center. but dont know the ideal basis for this. And only Maharashtra was affected because of this .
I got a trick to make use of free Internet on Airtel Mobile, make out the print and relish the Free Internet.
Airtel be carefull, or it could be harmfull for its next quarter profit logs.