OP, this is still good for you. If this ever goes as far as a hearing in front of a judge, it will be your word against that of a third party who was not even at the location. The burden of proof is on GeoupNexus to prove, not yours to disprove.
Whilst, your “evidence” may not seem to be overwhelming, if/when it comes to a claim, you will have good defence based on many points. You can also, guarantee that any claim filed will also contain errors and breaches on their part that you can use against them.
I am currently assisting someone with a similar claim which has so many breaches of the Civil Court Procedures that it is a total abuse of process and we can’t wait for it to get in front of a judge. We are confident that they are unlikely to let it go to a hearing because they would get spanked in court.
Of course no one knows exactly what is going to happen. There is always the chance that it doesn’t win. However, if it is well argued, you are unlikely to pay as much as is in the original claim. With that knowledge and situation you are in at this moment, you have little choice anyway. You can either pay the already inflated charge, which is what they are hoping you will do or wait and see if they are going to take it to a court claim. Even then, it does not mean that they will go all the way. They rely on their victims being gullible and ignorant of their rights and the process. You are here, so neither of those two things.
For now, keep your notes on what happened on the day. Keep all the other paperwork you received. Ride out the threatening debt collector letters that are going to come. Those you can file or discard, they are not what they seem. They are powerless to do anything that they threaten.
What you are waiting for, is a Letter of Claim. That will come from a firm of bottom-dwelling solicitors, such as DCB Legal (not DCBLtd), BW Legal or Gladstones and will give you 30 days to pay up. Any other letter that gives you anything less than 30 days is not a Letter of Claim and we don’t need to know about it.
Show us the LoC if/when it eventually arrives and we’ll take you through the next steps.