Airtel — Customer ID changed without knowledge

Address:	600061
Website:	www.aritel.in

I have obtained a SIM form Airtel on 2009. When obtaining the SIM i given my driving license as my proof. Myself and my family using it for about 7 years continuously. Meanwhile whenever i called customer care for the verification they used to check my ID, DOB and address. Recently we wished to change to nano sim and approached a AIrtel customer care office they said the SIM is under someone else name and address also different. We couldn't understand this that how a existing customer number details can changed with out their knowledge. This is sensitive issue. I wrote to their customer care and higher officials still no solutions. They keep sending their pre format emails as replies. I want airtel to produce my proof which i submitted during my SIM obtaining and explaining for this proof change