This is off-topic, but it fits the site name.
So you received a letter from “Sauvageau & Associes” telling you they’ll start proceedings against you unless you pay blah blah blah.
Well, fight it. Don’t fall for these scammers. Why do I happily call them scammers? Because they are willing to defend a company (MAC) that breaks the law. That’s right, they will threaten you with legal action to defend a company that didn’t follow the law. You can’t make this up.
Not to mention they don’t have a website. If you google it, all you will find is a page praising the accomplishments of its founder. I’m not even going to link to it, but you should look it up. It’s pretty sad.
If you can’t pay for a lawyer to fight the scammers, call the government’s toll-free Legal Aid Hotline and talk to a lawyer for free. They will be able to advise you on how to fight the scammers and minimize the costs of fighting the scammers.