Airtel Landline — bill against a non existent landline

Address:

Raipur, Chhattisgarh

I have received a cumulative bill of about 2,500/- against a land line with no [protected].Official record as per Airtel people showed the installation date to be on Feb 2012,which was never installed. The line was supposedly was disconnected because of non-pament of due on may- that too with out any notice !! On 29th of July i got a the Air-tel authority that a case has been filed against me in Delhi High-Court for the same.
Please clarify the matter as soon as possible otherwise I have to take the help of the consumer court for proper action against the company.
Please note : we have a broadband connection in my wife's name ( Dr kinjal bakshi, in the same address, from the same duration), for which we are paying the bills every month onetime.
Dr sumanta