[Resolved]  Maruti Suzuki Autocard — Autocad

maruti Suzuki AutoCard — Extra bill and non responsiveness

I have an AutoCard no. [protected]. I have been paying my bills in due time all the time.
In October 2008, I have not received the bill, only an SMS was received. Since the amount mentioned in SMS was greater than purchases made by me, I waited for the bill. Your customer care number is never reachable. Subsequently, I got a call in the month of November regarding payment due, I explained that amount seems to much more than my purchases, so please send me the bill. Following this, I received a bill with amount more than I have made purchases. It also had two items in the bill I have not purchased. I have informed that to the bank and asked them to look into the matter. I was assured that matter will be looked into and they will call me back. After that, I stopped using the card. Still I kept on getting the bills. A person from your bank called and I apprised her of the same. They said Ok We would send someone at your office (this was on December 8th, 2008) and pay only what you have purchased. The said person is yet to come. Only calls with similar promises have come. In the end, in disgust, I paid the bill amount of actual purchases made by me (it was Rs. 1242 but I paid Rs. 1250) in cash at ATM. Whenever someone called I told the story and each time they say we do not have the details right now. Yet I kept on getting the SMSs as well as calls. I am thoroughly disgusted with the same.
For a customer, who has been paying all the bills regularly, there is no reason for not paying the bill. That too, such a small amount! But, why should I pay for something I have not purchased?
What is the remedy for this. Is it their practice?