Whatever the date on the N1SDT form, which I can’t see, you have 14+5 days to file a defence or an Acknowledgment of Service, and if you file an AoS you have 28+5 days to file a defence.
You will need to file a defence based on the Particulars of Claim on the N1SDT form and any other relevant facts.
If you want assistance with your defence, please explain the background and post the relevant documents, the Notice to Keeper, Notice to Hirer, any appeal, any response to the appeal, and so on.
The claim is presumably against you, and you have to defend it. You can’t pass it on, transfer it or divert it, and if you do nothing you will end up with a default judgment against you.