Horrible and stupid employees

I settled my loan account in full on the 6th of June 2024, had a credit balance of R370, that must be paid back to me. Was advised to send my bank confirmation letter I did. While waiting received and email from them requesting my marriage certificate which I do not have as I am not married. I responded to them that I am single . So far haven’t received my R370. I even sent email s to complaint department they are same How can they asked for a marriage certificate , while on the application I stated that I am single almost two months waiting for a mere R370. How horrible they are not professional at all.