I'm a bit confused about the notice of rejection as it refers to two PCNs but presumably it's asking you to settle or appeal both of them.
Someone else may know if this is usual.
At the tribunal, certainly, PCNs are often grouped and taken together in one appeal.
But here separate and different reps were made for each.
Whatever, you should register an appeal that covers both PCNs and opt for a telephone or online hearing.
You can just say you rely on your representations for each PCN.
I think you'll end up paying one and the adjudicator will allow the appeal on the continuous contravention.
They may not contest of course.