Airtel Mobile
Non activation after verification & not returning documents

I had applied for a mobile connection from airtel, for which necessary document was provided & physical verification was also done, Because of some goof up from their side, they wanted to re-do physical verification which i refused. They have now refused to handover the documents collected from me as it is susceptible to be misused.

please suggest how to retrieve the document & they should be penalised for harrashmentNEVER GO FOR AIRTEL CONNECTION