Airtel — Sim not activated more than a week

Its been more than a week that airtel has given a duplicate sim to my brother but still have not activated it. I couldnt go to the store as I live in UK however I gave all the documents requested by the nodal office and my brother has got the sim but they have not activated it neither they have any information nor they are helping nor do they tell us what is taking so long for them to activate when a sim generally gets activated in few hours. Every time they say it will be activated in 24 hours however nothing has been done yet and days are passing by. Such a pathetic, poor, degraded service. My email is [protected]@gmail.com