Vodafone — Unwanted balance deduction and mannerless customer care

Address:

Pune, Maharashtra

hi,
my no. [protected]
i am a vodafone user
yesterday (22/05/2011) my 10rs deducted from my account and my balance became 0.55p after a while when i checked my balance agian i found that my balance became -3.56rs after that i recharged my no. with rs10 and my balance was 2rs..after sometimes my balance became -2rs
i called customer care 2 times got same response from both of them that you had used gprs but i didn't.
Today(23/05/2011) i called customer care again and i told my problem and he directly saying that you are lieing
i can show my whole 22/05/2011 log from my mobile as my nokia N72 has log Feature
but i want to show vodafones's cheapness by their policy only

1.Vodafone net doesn't gets connected when balance is below 1rs
but my balance goes in negative when i was having balance 0.55p
how??
how can i use net when it doesn't gets connected??

2. How balance can gets deducted when i am talking to customer care...is in 2G network also we can do call and data transfer simultaneously???

i had ported my no. to vodafone because of good network but i was unaware of their cheapness