Toyota SA and Toyota Arcadia non responsive to requests to register a complaint

150 000 km gone horribly wrong at Toyota Arcadia and when I alerted Toyota SA and the Toyota Arcadia Service Manager to this issue I did not receive a reply for 4 months. On the 5th month I decide to call Toyota SA to get what the progress is and indicated they had not seen this as a complaint. They then assisted with getting the Arcadia dealer principle on the line. During the call I was promised prompt feedback by the dealer principal and Toyota SA and this would be registered as a complaint. 4 working days later I am still without a complaint number and no response from either the dealer principle or Toyota SA.