Can anyone please advise on Property / Construction “DELICTUAL CLAIMS”?

I live in South Africa and in October 2007 I bought a house “Subject to Survey” The surveyor passed the structure – but since then the defects have gradually become extreme – main support wall resting on 1 gum pole – plaster is falling off, sever damp, water coming in, and on and on. The previous owners are both in property industry – the wife actually working for the estate agent i bought the house through (but not the actual agent person – but her husband was the conveyancer !) In SA, we have a “Voetstoots clause” basically “As is”. The house is almost un-livable due to the chronic damp and cold (average indoor temp is 13 degrees C) – I believe the previous owners hid the defects and the surveyor was negligent – he was appointed by the agent. This is a real mess and the law is confusing and not defined. Can anyone give me any help or advise – do I have a claim – Delictual or other – seller or surveyor ?? Desperate now – it’s winter and raining hard. Thanks.
NB – I’m needing legal info specifically for SOUTH AFRICA as laws here are different. Thanks.