I used the new UIF TERS website: https://uifecc.labour.gov.za/ 
Instructions are all there. I didn't use the "upload CSV" option, i added each staff member 1 at a time. Website is quite slow & a bit buggy, but worked. Will break it down below https://twitter.com/RochelleBarrish/status/1253237946335010819

1. Register company here: https://uifecc.labour.gov.za/ 
Use UIF REF number, not registration number. There's a link to get your REF number if not sure

2. You'll get notification email of successful registration, plus emails every time you log in
3. Add employee details, with the lockdown period & their wages during that time if any. Need ID numbers obvs

4. Choose if you want money to go to your account or theirs. I chose ours, cos could more easily track if it had happened. Now I have to pay it over to the staff
5. After some days (2 in my case) you'll just see a payment in the bank if it worked

6. Log in again & see details of who has been successfully processed & the amounts due to them
7. Download the acceptance letter from the link you'll see, sign it, & submit to [email protected] with proof of payment to their bank accounts

8. If you only have a few staff, add them one at a time through the capture screen. I think ppl are going wrong by using the "upload CSV" option & aren't formatting their CSV file correctly. If you have lots of ppl, 1 at a time is a drag tho

9. There are detailed instructions on the site about how to format the CSV, with screenshots and everything, but I imagine it's hard for some ppl not used to doing that