Estate agent not disclosing problems on the house

On 26 October 2023 I signed an offer to purchase a house through Zoe Ahlers at Holmz. We viewed the house but could not view the other parts of the house as there were still furniture and stuff in the house. We received the house keys on the 02 March 2024. On that day I did inspection and to find cracks in the study, wall cracks. I then informed Zoe of the cracks, and she told me it was foots toot. I then did my research and realise it was false information and wanted to cancel the sale. She then came back to say it is a crack that will need pollyfill. I then contacted the old owner and told him I am cancelling the contract. He subsequently spoke to Holmz (Oconnor) to fix the matter as Zoe was not working there anymore. The old owner sends a contractor to come do the quotation (R12000) which he sends to Holmz. They came back to me and refuse to pay they denied knowing about the cracks until the previous owner send me the document, he signed indicating that when he bought the house previously from same agent, he advised them of the cracks. I then forwarded the information to HOLmz whereby they decided to send their contractor who came and made his observation and then then referred me to a governmental engineer as I was disagreeing with his statements. I then send Zoe the proof that they knew about the cracks before they sold me the house. She then sends me the other contractor to come do evaluations. When he was checking he then removed some parts of the wall cracks outside believing he is going to come back and fix. When the quotation came back Zoe only wanted to fix the inside the cupboard not the other side of the wall. I refused the quotation to say she needs to fix everything as they were aware of both the issues and his contractor done more damage outside by removing parts of the cracks. This has been going for a year and still no resolution. I am not sure which ombudsman to report this to. The cracks are glowing as we having more rain and thunder. I need these cracks sorted or money paid so I can find a contractor to fix it.