I worked for a company last year for 7 weeks. I was only there a short time because they were dreadful and my manager was even worse, so I cut my losses and left before it all started to get to me (which I knew it would, it was only a matter of time). So, I left in May 2023. During this time, I didn't get a full month's payslip, so had no idea what my normal monthly pay was. I was also put on emergency tax, so grossly overtaxed for what I did do. I'd also accrued some travelling expenses, which were due back to me, and took me a lot of chasing and over a month after I left to actually get. So it was all a bit of a mess, and I just wrote it off, put it down to experience and moved on. Anyway, a month ago (so over a year after I'd left) I received an email saying that due to an admin error, I'd been overpaid and that I needed to pay back what was owed as a matter of urgency. This was not a huge amount (around £100). They also insinuated in the email that I may have been aware that I had been overpaid (certainly not the case due to the reasons I mentioned above). They gave me 14 days to pay what I owed. I ignored this email. Now, a month later I've received another email saying that the matter is urgent and if I don't pay up within 14 days they will pass my case to their debt collection agency which may incur additional charges and affect my credit score. Would they really do this for such a paltry amount, when it's their error, over a year since I left the business?? Wouldn't it cost more in legal and admin to try and recover it than its worth? Are they just bluffing and AIBU to continue ignoring this? I don't even know if what they're saying is correct anyway!