Paying loan with credit card was restricted.
Try to add the cc money to any wallet which allows to pay loan or bank transfer via wallet. some wallets marks as travel or utilities transaction so you get points too.
Try airtel wallet (9k), paytm wallet(4k), paytm fastag (9k) per ac. Simply do kyc for various numbers via pan,aadhar, voter id, driving licence etc paytm non kyc wallet amount can be transferred to paytm merchant. Airtel wallet via netbanking.
Or simple transfer cc balance p2p investment where you earn 1% per month. So 1% + card reward points.