Airtel — Deduction of Rs 185 approx without any reason

I was using GPRS pack of Rs.89 on my Airtel no +91-[protected](UP East) while on roaming.Its validity was upto 7th Feb 2010, on 7th Feb evening Rs 150 was deducted from my balance. Then after expiry of my GPRS pack I activated Rs.10 daily rental plan on 13th Feb at 1:06 am. After which Rs.34 were again deducted when I was using your GPRS service in evening. Followed by 2-3 more deductions of Rs 2–3 each same day.
There was no response when I tried to contact costumer care service.
Kindly seek necessary action against my complaint.