Wrong spelling of name and opening of ameli account not possible

I received the letter to send a picture etc to obtain my carte vitale, but the spelling of my name is wrong. I am supposed to contact my "organisme d'assurance", so probably ameli. However, the automatic answer to calls works awfully bad, there is no email contact, going to office also only sur rdv and I am also not able to open an online account at ameli.fr. I have the impression the cat bites its tail as so many times with French buerocracy since moving here. Sorry, but the last sentence had to be.