I think Justin has misread your post.
Being ex Traffic police in the UK there are a number of ways to sort this out. DO NOT sit there and do nothing.
You can copy and send the the following documents as proof you were not in Spain on this date.
1. Hire agreement if you have it, if not then any emails you have for your booking.
2. Flight booking confirmation can also show that you were not in Spain at the time and date.
3. Anyother documentation to prove you were not there.
Hope this can help you. Don't panic.