Shocking service from Howick Toyota dealership and demo model has a previous owner's details - how??

Took car for service on 12/11/2024. Service agent gave no updates, there was so much confusion for pick up (they had someone else's address)yet they dropped me off. There was no express service as it ended up taking a whole day. I arrived and asked Service Manager to open engine and show me what was done. He was not expecting that as my engine was filthy and he claimed his washer is broken and would cost R10k to fix so they steam washed. It didnt even look wiped! Further, they had someone else's details and could not tell me how a demo model bought from a Toyota dealer had another persons details plus address on it! I am still waiting for confirmation of details being updated and information from the place I purchased on why it had another person's details. Did they sell me a pre owned disguised as demo?? Was a proper service done? Why was I charged in full if they couldnt even do a wash of engine as would have been the case? Tried calling call centre with no luck. Finally got another person at Toyota to take my details down but still no response. I would NEVER recommend Toyota! I will escalate to Ombudsman