Keep Being Overpaid Despite Leaving in September

Mercdriver

You will get overpayments of tax due to BR back eventually. It will take some time and will either be added back through PAYE or through a money order to your home address.

etherealinsanity

An update on the situation:

I phoned ACAS this morning, but was told that they're unable to deal with issues of overpayments as their organisation only covers the illegality of underpayments. They did, however, tell me to get in touch with HMRC who could potentially force my old department to take action.

I called HMRC immediately afterwards and they ended the 'live job' status of the internship as of December 2019 which is still false but at least means I won't be taxed an emergency rate for my new job anymore. They also said they'd be launching an investigation as my old department is misleading HMRC with false payments that were never intended to enter my bank account, and potentially breaking laws. I need to send HMRC bank statements and emails as proof of this, and the investigation could take over a month, but I feel a bit better knowing that at least some progress is being made.

etherealinsanity

A further update:

HR have now closed my contract but have not, and have no intention of, informing HMRC of what has happened. They're now also in the process of trying to recover the overpayments made, bizarrely including for December (even though I never received a December payment because they blocked it from entering my account??).

I'm going to be sending 3 months worth of emails and bank statements to HMRC tomorrow morning and will wait to see what they say before taking any further action.