After struggling to get the UPC code and visiting the Jio and Idea stores they failed to port-in my connection without UPC.
As usual, RCOM failed to send me the UPC by trying all the methods available on the internet.
Finally, I have applied for Vodafone Postpaid without having the UPC, Yesterday night my RCOM number finally got ported to the Vodafone network.
All services are working fine.