Vodafone India — Getting new sim against damaged sim (transfer of ownership)

Address:

Mumbai City, Maharashtra, 400014

I have been using my brother's cell since quite long time. My sim seems to have got damaged & isn't getting detected. My brother isn't in the same city, vodafone guys are insist that my brother has to be physically present to get the sim. I have subscribed to plan, i'll be losing it. Noc, authority letter other attested proof isn't allowed, even banks permit noc/authority letters. Why is it that i have to migrate to postpaid to get the sim & retain the existing no., it should be allowed either way right!!!