Airtel — sim not activate after upgrade from 3g to 4g

Address:

Thane, Maharashtra, 400605

I have upgraded my 3g sim to 4g on 7th aug 2017 for the number (# [protected]). I received a message from airtel saying that'thank you! New sim will be activated shortly for your airtel mobile [protected]. Your old sim will work till the new sim gets activated. For security reasons, sms service will remain blocked for next 24hrs." once mobile displays no network i've insert the new airtel sim in my handset. I saved received setting then i received a message that your service have been set. Please restart your handset. So money times i have done the process (Restart) but so far my sim not activated. These massages are coming continuously.
On 8th august i've visited the near airtel gallery at kalwa manisha nagar (Pin 400605) and they told that they don't have solution try to connect customer care using another phone or contact main airtel gallery in thane. Three times i've called customer care but every time they give different excuses.1st time they told i've activated your sim and will start after 1 hour.2nd time they told me to remove and reinsert sim this will resolve your problem. But not working. 3rd time i spoke to senior person he told me your sim is active form our side, we can't do anything go to your nearest airtel gallery.
After connecting to you customer service center (3times) and visiting your gallery my sim is not activated.
9th and 10th august 2017 i've visited to airtel gallery in mulund. They also don't have solution. Still my sim is not activated.
I've emailed my complaint to [protected]@in. Airtel.com & [protected]@in. Airtel.com but no buddy bother to respond.

I'm very disappointed with airtel and your service.

Please resolve the issue as it is very important to have this number activated for me.
Regards,
Pradnya kulkarni.
Alternate contact: [protected].