So I go back to him and he accused me of lying and went and told the CEO. The CEO, a pretty chill guy with a doctorate, I was expecting to have a rational discussion about with but not he screamed at me too. I was downtrodden emotionally so I sheepishly said yeah I'll have another look and went back and started at it for another couple of days. No it was impossible. At that point I was stuck in a situation. I've got unemployment on one side and I've got getting screamed at inevitably. I just sat there in a depressed little hole with no options. I was angry, isolated and had no one sympathetic around. I suspect many people end up here.
Slept really badly that night. Woke up, got in the car and drove into the office. Got half way and got distracted by a cafe and decided I'd get breakfast and think some more about it. Sitting there eating a fat sausace, something just went ping, I SMS'ed John and the CEO with "fuck you I quit". I moved back in with my parents, did fuck all for 6 months, got another job, which was 80% less shit and the company I worked for went down the shitter about a year later because they couldn't deliver it.
If you feel like shit in a job, just leave. It's not worth it.