It doesn't surprise me in the least.
Having worked as an auditor for a debt collection company in the past, I witnessed first hand how the government had instructed them in the recovery of a great many 'debts' on their behalf, and was truly appalled by what was going on.
These included all manner of claims against people, dating back in some cases by decades - they resulted from the loss of, or failure to keep accurate records, as opposed to being genuine outstanding balances.
The collection companies contact regarding these alleged debts was the first the victims had heard about them, and were things like...
"Dear Mr Smith, as you commenced work on 3rd August, 1972, you were overpaid by £36.20 in dole money, and this now needs to be repaid in full immediately."
"...there is a £111.53 outstanding balance for a budgeting loan which you took out in 1983..."
etc. etc. etc.
If this were a creditor, they'd have no leg to stand on, but because it is governmental departments, the onus is on the individual to prove they don't owe it.
They had them chasing people for CSA payments, where both parties concerned had acknowledged in writing that either the payments had been made, or that there was an agreement between them that the figure should not be pursued. Also, where the CSA payment amount had not been duly reduced based on a notified reduction in income.
They bullied and harassed people in a way that would be deemed illegal, where it anyone else conducting themselves in this manner.
It was bloody horrifying, and I used to spend as much of my time as I could get away with, not conducting audits / training, but explaining to said 'debtors' how they could get out of paying, then following their cases up for them with the fricking CSA / DWP.
I haven't got the vocabulary to express my disgust.
If any company or sole trader / partnership (admittedly it wouldn't, apparently apply to banks) exhibited such a wanton negligence in the handling of the public's money H fookin MRC would be breathing flames down their necks!