Airtel — problem o[censored]pgradation to 4g sim

Address:

Kolkata, West Bengal, 721146

I was recently swap to airtel 3g sim to 4g sim, when i send 20 digits sim number to 121 confirmation msg also came,
Now 6 days over 3g network was not dead,
Again i sent code, one msg i received *your previous request for sim change on airtel number is already in process, your new sim activated shortly * showing, it's one week over..
Unluckily, my old sim is damaged now. I can't connect with anyone.. This is my permanent number.
What i have to do at this circumstance... Please help...