BSNL — Cut 20 Rs for 5 min Usage of GPRS

i have BSNlL prepaid mobile no.[protected].

On 1st November 6'O clock i have surf GPRS for 5 minutes.
My balance is disuct 20.39Rs

On Calling Customer Care. First Executive talks very rudely, he told me that you can not do anything. and cut my phone.

On Second time calling Mr. Imran don't give me proper answer and finally he cut the phone.

i am shocked how customer care executives talk with me.
they are very rude.