What do I say about why I left my last job? - first time posting

They always ask why I left, and I freeze. Any experience at all would help. I also do not want to seem like a risk. Do you mention numbers?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.