Buy a reliance communication 4G wipod from someone for super cheap like 300rs or so, since it's become a paperweight now after Rcom shut down its operations, and the person would be lucky to get any money for it.
Then get it remotely unlocked for 400 rs, I can give you the number of the guy who did it for me, and it is working perfectly well with Jio sim after the unlock, I'm attaching a screenshot as proof. You can dm me for the contact.