Double registered for same subject-Refund please

I am overwhelmed by UNISA, I was granted an opportunity to write my two last subject to complete my degree but no communication was made until I logged into my UNISA. I then realise that they double registered me as I paid for the registration fee because I thought I would be blocked out if I waited for them to give me the opportunity to automatically write my subjects without registerin,<br> Long story short may I please have myvrefund back as I am now double registered,I don't know how the system vdid pick that up.<br> <br> Really frustrated and grateful at the same time