This is the company that had a council tax payment in one account for the property, could see and agree the entitlement but could not transfer it into the correct account.
Fast-forward through 6 or 7 seven years of this and countless (cancelled) summons and office visits and the solution?
A letter to be produced in court, outlining Capita's inability to transfer the funds but assuring the court that if the bearer was forced to attend, they did not in fact owe the sum they were being summoned for.
Eventually (2 or 3 years later) a trainee who had been there 3 months transferred the sum and the matter was finally closed.
This happened about 10-20 years ago in a South London borough and I still have sight of the letter in question.