Vodafone India - No Network outside Delhi and rude unhelpful customer service

As soon as I leave Delhi to any other state, my Vi number stops working. I cannot make or receive calls or use Data. I complained to Vi customer care over the phone, went to the store, complained to their twitter but no one has resolved the issue. They changed my SIM card twice suggesting this can be the issue but it did not resolve the issue. I have tested an AirTel number of Delhi into my phone and that is working. I tried my Vi SIM into another phone (outside of Delhi) but it did not work. This is my main number and I receive all important calls, OTPs and Banking SMS on this number. I am not able to connect with anyone or do any job without my phone working. I have spent more than Rs **** on this SIM but not able to any of the credit. I am ** years old and getting frustrated with this and very confused at how Vi is dealing with this. People on phone are rude and not ready to help. In the store, people are not paying any attention to my issue and ignore me when I am asking to help. This is such a poor service from this company that make me question their ethical and moral business values they have.