The process has now been reverted to the PCN stage, so you can pay or appeal. So you can submit representations against the PCNs and TfL will respond to them as normal.
If you want advice on the PCNs, then please post them up here, and also tell us the circumstances for each one. GSV links to the locations would also be useful too. Redact only name and address on the PCNs. If these were postal PCNs you can also phone TfL and get them to send DVDs of the CCTV evidence. TfL then freeze the process for 14 days.
I have to say I am fairly alarmed at the enormous delay in the process. 2019 to 2025 is six years. If you can, try to find out from TfL when they served the Charge Certificates, and when they registered the debts at the Traffic Enforcement Centre.