Digitalocean existing credits not redeemed.

Context I tried to login through github pro account and availed the credits for digitalocean, and then created a droplet, I have just hosted 1 site therein, mostly I was learning, I had two docker containers running apart from that.

And I got a bill of $4.69, though when they tried to charge, rbi guidelines declined it, however, my account is now blocked, unable to create new resources.

I don't know why my credits aren't being used?

Can someone guide me?