Flashed at 258 km/h on the motorway (useful help)

When I opened my mail today, there was a flash image of me! I mean, I know that I have a lead foot and that eats often so that I am flashed! But when I read the speed I almost fell off the chair. Supposedly I said on the A1 in a 120 km/h zone and wrote 258 km/h?! How is this possible? Now I have to say sazu that I was on the road with the ST170. But also with the ST170. This is at least 216 km/h close. So how can it happen that they can prove me 258 km/h. That car is only optical and not tuned at the engine! I missed the sign, but had 180-200 km/h at most on the tacho. Please help me further and tell me what to do now! Can I confirm with an expert report that my ST170 can not be faster??? Or what should I do? Thanks already in advance!!! Ford-Focus-RS