Airtel
Sim blocked even i have handset with valid IMEI

Hi,

My mobile handset is Motorola Z6 which has valid IMEI no. I checked by sending the first 8 digit to 121.But Airtel blocked my handset saying it has invallid IMEI. When I called they said they cannot do anything. Why I can do?

This is my IMEI no : 355556010276600