you sold a car which still has hire purchase or you've setteled the hire purchase prior to selling to shitsome?
if it was still owned by FI, then need wait.

for refund, I just print statement with account number details enough, but I can tell you, it depends on the officer on duty also. So if you want safe & not waste time, maybe just ask bank if they can do so, as JPJ officer ask for it. If they refuse, then no choice, just proceed without.