I joined the complementary mutual through my emplo...

I joined the complementary mutual through my employer since January 2016. What was my surprise when I received my new card in December 2017, my schedule, etc .... The most absurd is that the increase is 102% .... I am extremely disappointed, the introductory prices were attractive ... I was fooled, and I'm not the only one I will inquire with the Prudential Supervisory Authority and Resolution and a Consumer Advocacy Association. If anyone can tell me if this is legal. Moreover I was warned of this increase 15 days before, whereas if I wish to cancel my contract I have a delay of 2 months !!!!! more and more unlikely. Unclear statements, very long repayment deadlines, etc. ....... TRIPLE ZERO ETOILE