Show us the N1SDT Claim Form, just the page with the Particulars of Claim (PoC) on them. Only redact your personal information, the claim number and the MCOL password. Leave EVERYTHING else visible, especially ALL dates.
Once you have done that, I will advise you on what you must do next. If you follow the advice, you will not have to pay a penny to anyone.
This will never go as far as a hearing. It will either be struck out or discontinued. However, that is quite way off for now and this process will take anything up to 6 months to conclude.
Even if this were to go to court and you lost, which is about as likely as hell freezing over, you would pay less than the claimed amount because the fake added £70 would never be allowed. But, as I said, this will not even get as far as a hearing as long as you follow the advice.