How to save toll free no starts with 1800?

Hi, today I came in front of a strange problem/bug of iOS 7. I am from India & here all the toll free no starts with 1800. I can call my bank's (Axis Bank) toll free no 1800 233 5577 from my iphone directly by dialling the number. But whenever I am saving the toll free in my contacts the phone automatically converts it into an USA no "+1(800) 233 5577" & the call could not be processed. Let me inform you, those toll free number doesn't work if you add '0' or '+91' (India calling code) in the beginning. How to save the number in my contacts from where I can directly make the call?