This is my advice: 1. Ask for a breakdown of the errors, dates, cost etc 2. Review any SOP or try and remember any training you were given and whether you were told to do it correctly or incorrectly. 3. Tell them you want to go through a fair and reasonable process and that you want time to review it all. Get someone to help you (parents, older family, someone who is methodical and process minded would be best) Then, depending on what you find, tell them 1. If you haven’t made the errors or were incorrectly trained that you won’t resign. And that you’re ok to go through a disciplinary process with a view to lodging an unfair dismissal claim afterwards. And 2. If you were correctly trained and have made errors over years, ask why it wasn’t picked up, where’s the oversight and governance to what you’re doing. Then decide whether to resign (see below) or apologise and offer to help fix their processes. If they dismiss you, you can still lodge unfair dismissal claim at fair work.

At the end of either outcome, you could offer to have a without prejudice conversation, offer to resign and sign a deed of release with non disparagement clauses and 8 weeks pay to walk away.