I remember this recall was not applicable to my vehicle's vin number a few years back, but checking it with Mercedes website it says it is for a recall. This seems back 2016. Neither the dealer nor Mercedes contacted me ever about this. Maybe the dealer just did the check when I took the vehicle for something else and said nothing.
Maybe the RTMC(UK it looks) got awakened somehow(And now the scamsters as well), maybe they hunt in the wild or did an audit on safety recalls and discovered something, who know's, in any case it look amateur operation..
There was a Takata Airbag recall, not 100% sure if its the same, however Takata filed bancruptcy.
It seems the scam is individuals posing as mercedes representitives and maybe collection of vehicles, this maybe the scam if your vehicle is collected...? So it seems the fraudsters zooms in on legit recalls, then get model ownder details and scam them. Death penalty is the only thing thats going to stop this type of activity.