Vodafone India — My subscription of international roaming for 30 days could not be activated but was charged in my bill

Address:

Mumbai City, Maharashtra, 400706

I am post-paid customer of Vodafone India and my number is [protected].I have requested for 30 days International roaming pack for my travel. I tried but could not get access to network in Singapore during my stay from September 10, 2015 to September 27, 2015. I have been charged in my bill and made the payment. I would request for refund. It has caused inconveniences and had to take a local connection during my stay in Singapore.
Kindly look into my complaints,

Dr Abhijit Gangopadshyay