Airtel — regarding 4g sim

Address:	781039
Website:	airtel

I have applied for a new 4g sim against my existing 3g sim on last week of november. It has been more than 10 days i have not received the sim; wherein it was mentioned that ti will be delivered within 4 days from the date of application.in addition, after i have applied for the new sim i have been facing connection issues i. E. Difficulty in calling and call not being connected. Kindly look into the matter seriously as i have been suffering for a long period. Thanks.