Medi clinic has a unilateral ban on waterbirths - because their idiots!
Anyway, your best chance at a waterbirth in hospital would be a private midwife at Vincent Pallottti hospital - in particular Angela Wakeford as she prefers her clients hire her own birthpools. VPH does have baths but they are somewhat shallow and so limit your manoeverability.
You can get in touch with her throughher website
www.angelathemidwife.co.za
There's also a private midwife run maternity home in Rondebosch - unfortuantly not all the midwives are skilled in waterbirths and you can't book your own midwife but may ne worth considering in terms of using water for pain relief
www.alnisamaternityhome.co.za
An even better option is to have a homebirth with a midwife & then hire a birthing pool - I rent them out -
www.birthworks.co.za
Good luck