Airtel — spamming and annoying warning messages

Address:

Kamrup Metropolitan, Assam, 781003

I had recently upgraded my airtel phone number - [protected] to 4g. I even got the 4g confirmation message. But i dont understand that even after upgrading it from 3g to 4g, i am still receiving warning messages from airtel stating that my number would be disconnected from airtel network if i dont upgrade within a specific date. Today, i even received a call saying that if i don't upgrade my number would be disconnected. What nonsense is this? I have already upgraded it, so why all this chaos? I have been using airtel for more than 10 years now and am utterly disappointed.