University Of Johannesburg failing to refund me

I am so disappointed with UJ, I deregistered in January 2019 and to this day 23 May 2019 i still haven't received my refund. i have been sending emails and calling but there's no one to assist

I get the very same people whom when responding only ask me for my student number which i have been giving them for long, after giving them my student number they no longer respond

I have communicated with different people and not even one of them is able to assist.