[Resolved]  Vodafone (Hutch) — charging usual std charge after charging india one plan

I have postpaid service customer of Vodafone Ltd.Of late I notice that the customer care of Vodafone does not take care of customer complaint.
The customer care only repeats same statement time and again.
I had availed roaming facility during my visit to Kolkata recently and had used the same for sms to my friends during Diwali. I was charged the sms charges (exorbitantly)for the same.I paid the same on receiving the bill for the same however the same charges are levied again on my next bill also.
On request to customer care the reply is that I have to settle the same as this was carried forward from preceding month when the same was settled in fact.
After repeated request still the customer care has not resolved the issue and is harrasing me as a customer.
I am feeling it is better to switch to another service provider.
I also seek suggestion as to what can be done to address this kind of treatment meted out by a reputed company.
This mail may alert others so that they may not fall victim and face humiliation as me.