Started new job 1st August 2016. It was horrendous so gave 4 weeks notice at end of February and left at the end of March 2017. I've just received a letter saying the finance team were not notified of my leaving at the appropriate time and they are requesting I repay a months salary received at the end of April. At the time I assumed it was my month in arrears. It's a big (dis)organisation and I think my line manager's manager probably forgot to tell the finance dept I had left. I haven't got another job so no income at the moment. Can I offer to pay it back in teeny tiny installments or AIBU?