They've handed you victory on a plate.
IMO, write back to them and do not bother about following the procedural route..you could still do this if necessary, but let's cut to the chase.
PCN ******* 12 Nov. 2024
I refer to the above regulation 9 PCN issued to my car on 12 Nov. 2024.
I also refer you to your letter dated 9 January 2025 rejecting my informal representations.
I further refer you to your Charge Certificate issued on 18 March 2025 on the grounds that you had issued a Notice to Owner on 12 November 2024, the same day that you issued the PCN.
For whatever reason, your notice procedures have failed and rather than wait for the Order for Recovery, Witness Statement, revocation order, NTO, formal representations and your cancellation of the PCN, either at this stage or on the subsequent direction of the adjudicator, I request that you cancel the PCN now.