Torrent performance generally sucks on Indian ISPs. You will get better speeds with public IP though (not provided by Excitel unfortunately).
My suggestion would be to get a seedbox instead of VPN if you only plan on torrenting a ton. seedhost.eu and ultraseedbox has good routing with Excitel. Ultraseedbox has a option to change route I think if default one is bad.
VPN would be better than downloading torrents regularly especially if VPN has port forwarding, but imo seedboxes are better for people who constantly torrent.
Also with a seedbox, if you have a large torrent with low seeders you can leave it downloading on seedbox without having any device at home on.