Airtel — sim not upgrade to 4g from 3g

Address:

Surat, Gujarat, 395001

Toady afternoon i went to airtel shop. I told them i want to upgrade my sim from 3g to 4g and its kolkata sim and iam staying in mahad raigad distric they said yes we can do. After they did process they told after 30 minutes u can use new 4g sim. When i inserted new sim there was no tower avaiable. Again i went to shop and sat there for 2 hours but they were not able to slove problem. Now my old sim and new sim both tower is not avaiable iam not bale to use my number, what to do,
My other contact no is:[protected]