Speeding fine

I’ve received a speeding fine for a time and place I was nowhere near. Do I have to pay the fine and then contest it? How do I contest it? Any advice much appreciated.

I have found how to appeal on line and done so. If anyone else ever needs it this is the link.

https://www.usagers.antai.gouv.fr/demarches/saisienumero

Sounds like “plate-jacking”, I read occasional reports about this in the French news outlets.