[Resolved]  Vodafone — Negative Balance in Prepaid

I am using Vodafone for last 15 years. I have been using pre paid services with indefinite calls and 100 SMS package. For last 3 weeks i am not able to send SMS message, but able to receive it. I checked the SMSC number it is correct in setting. My balance is --0.78 rupees!!!.
When i called customer care she says i have sent MMS. Why should i send MMS when i am using Whatsapp etc for sending messages.
Very poor service from Vodafone. These mobile mafia are making money out of their customers and provide very poor coverage, even within Chennai.
I am thinking of moving out of Vodafone.