Airtel Prepaid Mobile
International roaming

I have a sim of airtel no# 9685589289 last 9 month i have a problem in international roaming as now i m in tajikistan and last 15 days my sim is not working no network covrage shows sim registration fail. i have balance approx Rs.100 please give me some satisfactiry answer because i want my sim card start as soon as possible thank u waiting for your rply