Airtel — poor tat

Address: 400089

I was getting reminder to move to 4g from my existing sim(3g). Hesitantly when I moved( I was happy with 3g also) the sim is not working.

Dear Airtel team,
Kindly fix this or call at [protected] in case you need any details but you can't switch off my sim for 48 hours.
Just FYI: Vodafone changed my sim in 7 mins flat( including activation).