Airtel — airtel sim not working in roaming

Address:

Amethi, Uttar Pradesh, 227815

I am from kolkata. Now working in sultanpur, up. From last 6 days my sim stop working not even mine all roming sim stop working. I called customer care but no response. 6 day without your permanent contact number means lot. I get my flipkart item undelivered because no network. Lost a job opportunity because i can't receive call where i just join a interview and not able to receive confirmation call. Travel 50 km to swap sim card because custamor support told me that my sim was damaged.