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As long as your representations are received by the council by midnight on 24 July, the discount will be re-offered, so you might as well have a go, here's a draft representation:
Dear London Borough of Wandsworth,
I challenge liability for PCN WA88495191 on the basis of a collateral challenge. The notice is ambiguous as to what 28 day period is available to make representations, the information on page one indicates this is the period of 28 days starting with the date of the notice, while the information on page 2 indicates it is 28 days starting with the date of service of the notice.
There are severe consequences for failing to comply with these deadlines, which must therefore be conveyed clearly and without ambiguity. In light of this, the penalty charge must be cancelled.
Yours faithfully,
In the meantime I'll get hold of the traffic order. The council will certainly reject but they might also make further mistakes in the Notice of Rejection, which might open other avenues.