I got a job a year ago, I now dread going, hate it in fact, there's no loyalty and it's very toxic. I've been retraining in a different career and told my line manager. Well he's said I've let him down, that the job I took was a permanent position. I said to him the job isn't what I was told it would be that I was misled. I have a applied for a few jobs and one has offered me a interview, would I be unreasonable if I rang in sick for the day instead of telling him. He has to authorise my time off but I don't know what the atmosphere will be like.