Vodafone India — vodafone post paid to prepaid conversion issue-need help

Address: 122004

I was using vodafone number from more than 10 years now. I had to go to outside india for a month, so i requested my number to be ported to pre-paid. My first surprise was that number was not being ported, instead a new connection request was placed. I was then told that it will take 3 days to completed, again don't see any reason for such a delay. Finally i was given a sim card which was not active for 4 days. Once i left india, both the sim cards were not working, finally pre-paid one started catching signals but when i was calling 59059 for verification, not working at all. I have tried customer care multiple times but they don't provide any solution.
I am in trouble as it is my primary number that is used in banking. Please suggest any solution.