Airtel — international roaming for europe

I purchased international roaming for europe on 16th september 2017 with validity of 10 days. Partial facility activated on 17th september 2017 with calling only and data service was not active. After email data service was activated on 19th september 2017. From 21st september international roaming completely stopped causing great inconvenience abroad. Email was done to airtel customer care, and they replied that they will look into the matter in next 72 hrs. I returned back to india on 24th morning to india without any correction or response fro airtel. After reaching india i wrote to nodal manager whic replied that it is true that services were not for full package time of 10 days and worked only 03 days, but they refused to refund the amount. I feel it is is cheating and matter of violation of our right for full package promised for which we paid full amount in advance