[Resolved]  Airtel Service Provider — wrong legal notice send to me

I have this airtel postpaid connection on the name of rahul chaudhary, previously in the month of june'09 i paid all the billed n unbilled amt (approx 670 sumthing)in airtel gomti nagar,lucknow connect,submitted my id and address proof properly and they migrated my postpaid no. to prepaid on my name and address............Now after 4 months suddenly my fren rahul received the legal notice from airtel side asking him to pay another 1123/- amt saying that this is the due left to be paid or watever the story....................can u pls tell me that after paying all the dues they converted my no. to prepaid so hw come this legal notice raised...itz just bcoz the due negligence of the airtel gomti nagar staff that me and my fren is facing this major prob. my mob. no. is [protected](now on my name varsha singh).I want that strict action should be taken against all the airtel gomti nagar staff.