I am due a refund but I don't have a 2012 tax return as I was studying full time.

Hi there. I'm due a refund from SARS but it might be withheld as I did not submit a return in 2012. I wasn't working in 2012 as I was studying full time. Please advise what I need to do in order to ensure all my tax returns are up to date? Thanks

You will then need to submit a nil tax return for 2012.
How to submit a nil tax return