No Answer when calling Customer Service

I took out a loan on 21 August but ended up paying the entire amount on 02 September. When I queried why there was still a balance, I was advised it is the Settlement amount. I paid this on 09 September. I can see on the App that the Account Info shows Settled but there is a small amount of R1.91 on the account. I have now called numerous times without answer, when requesting a call back it does not work. Please can this account be closed, it is impacting negatively on my Credit Report.