Airtel — 4g sim activation error

Address:	Amritsar, Punjab, 143005
Website:	airtel network upgrading

Hi, airtel services upgraded my sim to 4g and delievered it to me. Now its been a week and still my old 3g sim is not deactivated. My sim is not upgraded to 4g sim, is it meant that? I send request four times for the sim change following all the steps correctly as they mention on 4g sim voucher. Everytime they send a message that your request is in process. Its really irritating and waste of time. Please let me know that how much time they are going to accept my sim change request so that i can start my 4g services.
Thank you
Diksha