UC gross calculation failure

Hello,

I am facing the following problems with UC who make mistakes then refuse to rectify them :
I have currently two live UC Appeals : The first Case relates strictly to my missing Universal Credit disability elements. My second June 26 recent case relates to fabricated overpayment.
The DWP claims I failed to declare a pension. This is a complete fabrication. My partner receives a pension paid contractually on a quarterly basis every three months, The DWP Review Team has committed a gross calculation failure by inputting this three month quarterly sum into their automated system as a single monthly payment.
Instead of dividing the quarter by three, their software treated the quarterly payment as a monthly figure, artificially tripling our household income and backdating this software glitch over 26 months to manufacture a fictitious £6,543.81 pence overpayment balance.
I have already uploaded my UC Journals original June Statement alongside the Amended June Statement proving that on 29 July 2026 the DWP retroactively altered my paid history to hide this blunder.

That leaves us with £147.00 this month to live off, UC will not cancel the deductions of these payments whilst waiting for this latest Appeal, our first appeal has been going now for 2 years because UC will not provide an offset statement myself and the judges have asked for.
Can I do anything? UC hide behind Debt Management telling me Debt Management will not stop the collection of these payments, and to wait for the appeal decision which could take years?
Why are DWP/UC allowed to get away with these errors and just expect the courts to pick up and rectify their mistakes ?
Lali