What ticket stock is your ticket on?
(Does your e ticket number start with 083 or 220?)
If the latter is the case the TA should be able to rebook you easily on a LH flight. Or cancel the whole journey with a full refund. Keep in mind LH takes forever to issue refunds atm.
Regarding SAA ticket stock... Nobody really knows what's going to happen to SAA atm, not quite sure they'll even be able to refund you at all.