Airtel — Circle change issue

Address:

Mumbai City, Maharashtra, 421204

On 3rd Dec 2016 I had requested to Airtel Gallery at koparkharne near HDFC bank to change my circle that is Karnataka to mumbai also provided all required documents miss Monika was attending me. After completing the procedure she told within 7 days your circle will get change. You will receive one sms after that your old sim will get disconnected, then you need to insert new sim which will get activated with in few hrs. I waited for 10day I haven't received any sms when I crossed check with Same Gallery I found all my documents where laying on their desk. When I asked them they replied sorry sir due system error your process is pending. After that again all the process was done again the same answer that to change the circle it will take 7 day and now this time it will get done 100%. Yesterday I received one sms saying that your old sim will get disconnected then you need to insert new sim which will get activated within few hrs. Now it is more than 20 hrs but new sim is still not activated. Again I went to Airtel Gallery then I found that my old sim is disconnected but new sim is still in process which will take time. I asked Monica how much time it will take she said sir I had drop the mail to our team they will reply.
My question is Airtel have authority to disconnect the customer sim for more then 20hrs without informing customer.
Second question if Airtel Gallery don't know how much time it will take then what they are doing their in Gallery.
And how they are irresponsible to keep my documents on hold for 10days without informing me.

Sorry to say but Airtel is one off pathetic service provider