The timeline of PCN events doesn't seem to match your narrative. The original PCN was issued on 23rd March, reps accepted 5th May, new PCN sent 6th May, then representations submitted and under review 20th May, and finally a CC issued on 25th June.
So it seems somebody submitted reps on 20th May, but there is no Acceptance/Rejection event after this, only the CC being sent out. Can it tbe that the wrong address number as an actual address and that person submitted reps saying it wasn't him ?
You might try phoning the council to find out what is going on, and also get ready to submit a Statutory Declaration when they register the debt at TEC. You will receive an Order for Recovery, and you can truthfully state that you did not receive the PCN.