Can you please post all documents, and all pages and all parts of a page of those documents; it is important.
Is the name and address on your V5 Registration Certificate for the vehicle correct in all aspects, and the same as it was on the day of the contravention ?
The £240 indicates that you have now received a Charge Certificate. If so, you'll have to wait until the debt is registered at the Traffic Enforcement Centre, at which point you can submit a Witness Statement that you submitted representations, but didn't get a reply. This gets you back to the PCN stage, but not the discount point, I'm afraid.