Dodgy visit from FREE in France

Dodgy visit from FREE in France. 

I am in France, in second home. I notice our mobile network when roaming is FREE, both for my wife and myself. 

We had a visit from an "engineer" from "FREE" wanting to install a FreeBox for our WiFi. He wanted to come into our house - refused. We requested his paperwork - none. Told him we are on Orange here.

I can't get to someone in Smarty to see if FREE are a recommended network supplier for roaming. If so I would report this. Any way I can actually talk to someone in Smarty because I need to discuss this with them.?

Thanks, Ian