So glad to hear your IP has accepted that it was just an oops! rather than a deliberate act. Working out how to pay it back and not hinder your I&E is now the easy bit. Well done to your IVA company for their joined up response.
Last Payment made 04/12/14. Completion Certificate 25/7/15. IVA company GT. No Issues
Good for you - and outcome as anticipated, but glad to see that the forum gave you the courage to address this issue and that now you feel much better. And good luck with the new job as well.